diff --git a/HarmonyOSNEXTApp b/HarmonyOSNEXTApp
new file mode 160000
index 0000000..a7a4a9f
--- /dev/null
+++ b/HarmonyOSNEXTApp
@@ -0,0 +1 @@
+Subproject commit a7a4a9f94c069706f1a32d7fccfaa0cac4a5e387
diff --git a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/activity/main/MainActivity.java b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/activity/main/MainActivity.java
index cb61355..bdca88e 100644
--- a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/activity/main/MainActivity.java
+++ b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/activity/main/MainActivity.java
@@ -12,8 +12,15 @@ import android.os.Build;
 import android.os.IBinder;
 import android.provider.Settings;
 import android.util.Log;
+import android.view.View;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.Spinner;
 import android.widget.Toast;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.core.app.ActivityCompat;
@@ -56,6 +63,7 @@ public class MainActivity extends BaseMvvmActivity<MainViewModel, ActivityMainBi
             // 注册状态监听，使界面能感知信令断开/控制端断开并同步显示。
             screenCaptureService.setStateListener(MainActivity.this);
             setupLocalPreview();
+            setupResolutionSpinner();
         }
 
         @Override
@@ -271,6 +279,82 @@ public class MainActivity extends BaseMvvmActivity<MainViewModel, ActivityMainBi
         binding.btnStop.setEnabled(running);
         binding.etServerUrl.setEnabled(!running);
         binding.etDeviceId.setEnabled(!running);
+        binding.spinnerResolution.setEnabled(running && isBound);
         binding.tvStatus.setText(running ? "状态: 运行中" : "状态: 已停止");
     }
+
+    /** 分辨率预设（按长边像素描述，0/负数表示使用设备原生分辨率）。 */
+    private static class ResolutionPreset {
+        final String label;
+        final int longEdge;
+
+        ResolutionPreset(String label, int longEdge) {
+            this.label = label;
+            this.longEdge = longEdge;
+        }
+
+        @Override
+        public String toString() {
+            return label;
+        }
+    }
+
+    /** 构建分辨率下拉框并在本地/远端切换时同步显示当前采集分辨率。 */
+    private void setupResolutionSpinner() {
+        if (screenCaptureService == null) return;
+
+        int nativeLong = screenCaptureService.getNativeLongEdge();
+        List<ResolutionPreset> presets = new ArrayList<>();
+        presets.add(new ResolutionPreset("原始 (" + nativeLong + ")", nativeLong));
+        presets.add(new ResolutionPreset("1080P", 1920));
+        presets.add(new ResolutionPreset("720P", 1280));
+        presets.add(new ResolutionPreset("480P", 854));
+
+        ArrayAdapter<ResolutionPreset> adapter = new ArrayAdapter<>(
+                this, android.R.layout.simple_spinner_item, presets);
+        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
+        binding.spinnerResolution.setAdapter(adapter);
+
+        // 选中当前采集分辨率对应的预设
+        int[] cur = screenCaptureService.getCurrentCaptureResolution();
+        int curLong = Math.max(cur[0], cur[1]);
+        int selectIdx = 0;
+        int bestDiff = Integer.MAX_VALUE;
+        for (int i = 0; i < presets.size(); i++) {
+            int diff = Math.abs(presets.get(i).longEdge - curLong);
+            if (diff < bestDiff) {
+                bestDiff = diff;
+                selectIdx = i;
+            }
+        }
+        binding.spinnerResolution.setSelection(selectIdx);
+        updateCurrentResolutionText(cur[0], cur[1], cur[2]);
+
+        // 注册监听：本地或远端切换分辨率后刷新当前分辨率文本
+        screenCaptureService.setResolutionListener((w, h, fps, fromRemote) ->
+                runOnUiThread(() -> updateCurrentResolutionText(w, h, fps)));
+
+        // 注意：先 setSelection 再设置监听，避免初始化时触发一次多余的切换。
+        binding.spinnerResolution.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
+                if (screenCaptureService == null) return;
+                ResolutionPreset preset = (ResolutionPreset) parent.getItemAtPosition(position);
+                int[] now = screenCaptureService.getCurrentCaptureResolution();
+                int nowLong = Math.max(now[0], now[1]);
+                // 与当前一致则不重复切换，避免无谓的提示与编码重启
+                if (preset.longEdge == nowLong) return;
+                screenCaptureService.changeResolutionByLongEdge(preset.longEdge);
+            }
+
+            @Override
+            public void onNothingSelected(AdapterView<?> parent) {
+            }
+        });
+    }
+
+    private void updateCurrentResolutionText(int w, int h, int fps) {
+        binding.tvCurrentResolution.setText(
+                String.format("当前: %dx%d @ %dfps", w, h, fps));
+    }
 }
diff --git a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/input/InputCommandHandler.java b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/input/InputCommandHandler.java
index d38d94f..43f51c0 100644
--- a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/input/InputCommandHandler.java
+++ b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/input/InputCommandHandler.java
@@ -18,6 +18,13 @@ public class InputCommandHandler {
     private final int screenHeight;
     private final InputExecutor inputExecutor;
 
+    /** 控制端请求切换屏幕采集分辨率时的回调（由 ScreenCaptureService 实现）。 */
+    public interface ResolutionRequestListener {
+        void onResolutionRequested(int width, int height, int fps);
+    }
+
+    private ResolutionRequestListener resolutionListener;
+
     public InputCommandHandler(int screenWidth, int screenHeight) {
         this(screenWidth, screenHeight, new SystemInputUtils());
     }
@@ -35,6 +42,10 @@ public class InputCommandHandler {
         this.inputExecutor = inputExecutor;
     }
 
+    public void setResolutionRequestListener(ResolutionRequestListener listener) {
+        this.resolutionListener = listener;
+    }
+
     public void handleCommand(byte[] data) {
         try {
             ControlMessage command = ControlMessage.parseFrom(data);
@@ -56,6 +67,15 @@ public class InputCommandHandler {
                 case MOTION_EVENT:
                     handleMotionEvent(command);
                     break;
+                case SET_RESOLUTION:
+                    // 分辨率切换不依赖输入执行器，转发给屏幕采集服务处理。
+                    if (resolutionListener != null) {
+                        resolutionListener.onResolutionRequested(
+                                command.getWidth(), command.getHeight(), command.getFps());
+                    } else {
+                        Log.w(TAG, "SET_RESOLUTION received but no listener registered");
+                    }
+                    break;
                 default:
                     Log.w(TAG, "Unknown action: " + action);
             }
diff --git a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/service/ScreenCaptureService.java b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/service/ScreenCaptureService.java
index 7f4a5fc..3ed45a4 100644
--- a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/service/ScreenCaptureService.java
+++ b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/service/ScreenCaptureService.java
@@ -83,6 +83,13 @@ public class ScreenCaptureService extends Service {
     private String pendingOfferSdp;
     /** 当前正在控制本设备的控制端名称（用户名或设备 ID），用于断开提示。 */
     private String controllingName;
+    /** 设备真实屏幕分辨率，用于分辨率切换时按宽高比计算采集尺寸。 */
+    private int realScreenWidth;
+    private int realScreenHeight;
+    /** 当前实际采集分辨率与帧率（运行时可被本地/远端请求切换）。 */
+    private int currentCaptureWidth;
+    private int currentCaptureHeight;
+    private int currentCaptureFps;
     /** 主线程 Handler，用于从 WebRTC 回调线程切回主线程执行 UI 提示。 */
     private final Handler mainHandler = new Handler(Looper.getMainLooper());
     /** 标记服务是否正在关闭，避免重复停止/重复弹窗。 */
@@ -137,6 +144,8 @@ public class ScreenCaptureService extends Service {
         }
         int realWidth = dm.widthPixels;
         int realHeight = dm.heightPixels;
+        this.realScreenWidth = realWidth;
+        this.realScreenHeight = realHeight;
 
         // 分辨率缩放逻辑：如果设备分辨率大于 1080p，则等比例缩小到 1080p 以内
         int captureWidth = realWidth;
@@ -167,8 +176,15 @@ public class ScreenCaptureService extends Service {
         Log.i(TAG, "Real resolution: " + realWidth + "x" + realHeight);
         Log.i(TAG, "Capture resolution: " + captureWidth + "x" + captureHeight + " @ " + fps + "fps");
 
+        // 记录初始采集分辨率，供 UI 与运行时切换使用
+        this.currentCaptureWidth = captureWidth;
+        this.currentCaptureHeight = captureHeight;
+        this.currentCaptureFps = fps;
+
         // 输入处理器必须使用真实分辨率进行坐标映射
         inputHandler = new InputCommandHandler(realWidth, realHeight, createInputExecutor());
+        // 控制端发来的 SET_RESOLUTION 指令转交本服务处理（坐标映射与输入执行器无关）。
+        inputHandler.setResolutionRequestListener(this::onRemoteResolutionRequested);
 
         // 开启屏幕捕获，使用计算出的 capture 分辨率
         startScreenCapture(resultCode, resultData, serverUrl, deviceId, captureWidth, captureHeight, fps);
@@ -216,6 +232,90 @@ public class ScreenCaptureService extends Service {
         return webRtcClient;
     }
 
+    /**
+     * 切换屏幕采集分辨率（本地 UI 调用）。
+     * @param longEdge 目标长边像素；<=0 表示使用设备原生分辨率（按屏幕宽高比缩放）。
+     */
+    public void changeResolutionByLongEdge(int longEdge) {
+        requestResolutionChange(longEdge, 0, 0, false);
+    }
+
+    /** 返回当前采集分辨率（宽/高/帧率）。 */
+    public int[] getCurrentCaptureResolution() {
+        return new int[]{ currentCaptureWidth, currentCaptureHeight, currentCaptureFps };
+    }
+
+    /** 返回设备原生分辨率的长边（像素），供 UI 生成“原始画质”选项。 */
+    public int getNativeLongEdge() {
+        return Math.max(realScreenWidth, realScreenHeight);
+    }
+
+    /** 控制端经 DataChannel 发来的 SET_RESOLUTION 指令入口。 */
+    private void onRemoteResolutionRequested(int width, int height, int fps) {
+        requestResolutionChange(width, height, fps, true);
+    }
+
+    /**
+     * 解析并应用目标采集分辨率。
+     * 语义（与控制端约定一致）：
+     * - width <= 0：使用设备原生分辨率。
+     * - height <= 0：仅按 width 指定长边，按屏幕宽高比计算另一维度。
+     * - 否则使用精确 width x height。
+     * 最终宽高会偶数对齐（部分 H264 编码器要求），并触发一次关键帧刷新远端画面。
+     *
+     * @param width     目标宽度/长边（像素）
+     * @param height    目标高度（像素，<=0 时按宽高比计算）
+     * @param fps       目标帧率（<=0 时沿用当前帧率）
+     * @param fromRemote 是否由远端控制端触发（仅用于 UI 提示区分）
+     */
+    public void requestResolutionChange(int width, int height, int fps, boolean fromRemote) {
+        int[] size = resolveCaptureSize(width, height);
+        int targetW = size[0];
+        int targetH = size[1];
+        int targetFps = fps > 0 ? fps : currentCaptureFps;
+        if (targetFps <= 0) targetFps = 30;
+
+        if (webRtcClient == null) {
+            Log.w(TAG, "requestResolutionChange ignored: WebRTC not ready");
+            return;
+        }
+
+        webRtcClient.changeCaptureFormat(targetW, targetH, targetFps);
+        currentCaptureWidth = targetW;
+        currentCaptureHeight = targetH;
+        currentCaptureFps = targetFps;
+
+        Log.i(TAG, "Capture resolution changed -> " + targetW + "x" + targetH + " @ " + targetFps + "fps (remote=" + fromRemote + ")");
+        showToast(getString(R.string.resolution_changed_message, targetW, targetH));
+
+        if (resolutionListener != null) {
+            resolutionListener.onResolutionChanged(targetW, targetH, targetFps, fromRemote);
+        }
+    }
+
+    /** 根据指令参数解析出最终采集尺寸（保留屏幕宽高比、偶数对齐）。 */
+    private int[] resolveCaptureSize(int width, int height) {
+        int w, h;
+        if (width <= 0) {
+            w = realScreenWidth;
+            h = realScreenHeight;
+        } else if (height <= 0) {
+            int longEdge = Math.max(realScreenWidth, realScreenHeight);
+            float scale = (float) width / longEdge;
+            w = Math.round(realScreenWidth * scale);
+            h = Math.round(realScreenHeight * scale);
+        } else {
+            w = width;
+            h = height;
+        }
+        // 偶数对齐（部分 H264 编码器要求宽高为偶数）
+        if (w % 2 != 0) w--;
+        if (h % 2 != 0) h--;
+        if (w <= 0) w = 2;
+        if (h <= 0) h = 2;
+        return new int[]{ w, h };
+    }
+
     /**
      * 状态回调。由已 bind 的 MainActivity 注册，用于把连接状态同步到界面。
      */
@@ -232,6 +332,19 @@ public class ScreenCaptureService extends Service {
         this.stateListener = listener;
     }
 
+    /**
+     * 分辨率变化回调。由已 bind 的 MainActivity 注册，用于在界面上同步当前采集分辨率。
+     */
+    public interface ResolutionChangeListener {
+        void onResolutionChanged(int width, int height, int fps, boolean fromRemote);
+    }
+
+    private ResolutionChangeListener resolutionListener;
+
+    public void setResolutionListener(ResolutionChangeListener listener) {
+        this.resolutionListener = listener;
+    }
+
     @Override
     public void onDestroy() {
         super.onDestroy();
diff --git a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/webrtc/WebRtcClient.java b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/webrtc/WebRtcClient.java
index 002e8a8..5366bfc 100644
--- a/WebRTCControlled/app/src/main/java/com/ttstd/controlled/webrtc/WebRtcClient.java
+++ b/WebRTCControlled/app/src/main/java/com/ttstd/controlled/webrtc/WebRtcClient.java
@@ -6,6 +6,8 @@ import android.util.Log;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.JsonObject;
+import com.ttstd.control.Action;
+import com.ttstd.control.ControlMessage;
 import com.ttstd.controlled.signaling.SignalMessage;
 import com.ttstd.controlled.signaling.WebSocketClient;
 
@@ -148,6 +150,69 @@ public class WebRtcClient {
         }
     }
 
+    /**
+     * 运行时切换屏幕采集分辨率（无需重建采集器/连接）。
+     * 通过 {@link org.webrtc.VideoCapturer#changeCaptureFormat} 平滑改变编码尺寸，
+     * 并触发一次关键帧，避免远端解码器出现花屏/卡顿。
+     *
+     * @param width  目标宽度（像素，需为偶数）
+     * @param height 目标高度（像素，需为偶数）
+     * @param fps    目标帧率，<=0 时沿用当前帧率
+     */
+    public void changeCaptureFormat(int width, int height, int fps) {
+        if (videoCapturer == null) {
+            Log.w(TAG, "changeCaptureFormat ignored: capturer not ready");
+            return;
+        }
+        int targetFps = fps > 0 ? fps : this.videoFps;
+        if (targetFps <= 0) targetFps = 30;
+        Log.i(TAG, "Changing capture format -> " + width + "x" + height + " @ " + targetFps + "fps");
+        try {
+            videoCapturer.changeCaptureFormat(width, height, targetFps);
+        } catch (Exception e) {
+            Log.e(TAG, "changeCaptureFormat failed", e);
+            return;
+        }
+        this.videoWidth = width;
+        this.videoHeight = height;
+        this.videoFps = targetFps;
+        // 编码尺寸变化后诱发关键帧，使远端立即刷新画面。
+        triggerKeyFrame();
+        // 主动把最新采集分辨率上报给控制端，使其 UI 与实际保持一致。
+        sendResolutionReport(width, height, targetFps);
+    }
+
+    /**
+     * 通过 DataChannel 把当前实际采集分辨率上报给控制端（action=REPORT_RESOLUTION）。
+     * 控制端（网页/Android/Flutter）据此同步展示当前分辨率，避免 UI 与实际不一致。
+     */
+    public void sendResolutionReport(int width, int height, int fps) {
+        if (dataChannel == null || dataChannel.state() != DataChannel.State.OPEN) {
+            Log.d(TAG, "sendResolutionReport skipped: dataChannel not open");
+            return;
+        }
+        try {
+            ControlMessage report = ControlMessage.newBuilder()
+                    .setAction(Action.REPORT_RESOLUTION)
+                    .setWidth(width)
+                    .setHeight(height)
+                    .setFps(fps)
+                    .build();
+            ByteBuffer buffer = ByteBuffer.wrap(report.toByteArray());
+            // binary=true：必须作为二进制发送，控制端按 protobuf 二进制解析；
+            // 若传 false 会被当作文本，Web 端收到的将是字符串导致解码失败。
+            dataChannel.send(new DataChannel.Buffer(buffer, true));
+            Log.i(TAG, "Reported capture resolution -> " + width + "x" + height + " @ " + fps + "fps");
+        } catch (Exception e) {
+            Log.e(TAG, "sendResolutionReport failed", e);
+        }
+    }
+
+    /** 返回当前采集分辨率（像素），用于 UI 展示。 */
+    public int[] getCurrentResolution() {
+        return new int[]{ videoWidth, videoHeight, videoFps };
+    }
+
     private VideoSink localSink;
 
     public void setLocalSink(VideoSink sink) {
@@ -372,7 +437,10 @@ public class WebRtcClient {
             @Override
             public void onStateChange() {
                 Log.d(TAG, "DataChannel state: " + dc.state());
-                if (dc.state() == DataChannel.State.CLOSED) {
+                if (dc.state() == DataChannel.State.OPEN) {
+                    // 通道建立后，立即把当前实际采集分辨率上报给控制端（初始值或最近一次切换值）。
+                    sendResolutionReport(videoWidth, videoHeight, videoFps);
+                } else if (dc.state() == DataChannel.State.CLOSED) {
                     notifyRemoteDisconnected();
                 }
             }
diff --git a/WebRTCControlled/app/src/main/proto/control_message.proto b/WebRTCControlled/app/src/main/proto/control_message.proto
index e72212d..99c6720 100644
--- a/WebRTCControlled/app/src/main/proto/control_message.proto
+++ b/WebRTCControlled/app/src/main/proto/control_message.proto
@@ -13,6 +13,8 @@ enum Action {
   KEY = 3;
   LONG_PRESS = 4;
   MOTION_EVENT = 5;
+  SET_RESOLUTION = 6; // 控制端请求被控端切换屏幕采集分辨率
+  REPORT_RESOLUTION = 7; // 被控端上报当前实际采集分辨率（含连接建立后的初始值）
 }
 
 // 通过 RTCDataChannel 传输的控制指令（protobuf 二进制）。
@@ -38,4 +40,12 @@ message ControlMessage {
 
   // 原始动作（MOTION_EVENT）：对应 Android MotionEvent ACTION_*（0=DOWN 1=UP 2=MOVE）
   int32 motion_action = 11;
+
+  // 分辨率切换（SET_RESOLUTION）：
+  // width 为目标长边/宽度；<=0 表示使用被控端原始（native）分辨率。
+  // height 为目标高度；<=0 时按被控端屏幕宽高比基于 width 计算（保留原始比例）。
+  // fps 为目标帧率；<=0 表示沿用当前帧率。
+  int32 width = 12;
+  int32 height = 13;
+  int32 fps = 14;
 }
diff --git a/WebRTCControlled/app/src/main/res/layout/activity_main.xml b/WebRTCControlled/app/src/main/res/layout/activity_main.xml
index 93caa4c..e736a90 100644
--- a/WebRTCControlled/app/src/main/res/layout/activity_main.xml
+++ b/WebRTCControlled/app/src/main/res/layout/activity_main.xml
@@ -76,6 +76,30 @@
                 android:enabled="false"
                 android:text="停止屏幕共享" />
 
+            <TextView
+                android:id="@+id/tv_resolution_label"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="16dp"
+                android:layout_marginBottom="8dp"
+                android:text="@string/resolution_label"
+                android:textSize="14sp" />
+
+            <Spinner
+                android:id="@+id/spinner_resolution"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginBottom="8dp"
+                android:enabled="false" />
+
+            <TextView
+                android:id="@+id/tv_current_resolution"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginBottom="8dp"
+                android:text="当前: -"
+                android:textSize="14sp" />
+
             <org.webrtc.SurfaceViewRenderer
                 android:id="@+id/local_view"
                 android:layout_width="match_parent"
diff --git a/WebRTCControlled/app/src/main/res/values/strings.xml b/WebRTCControlled/app/src/main/res/values/strings.xml
index 449236f..8aea73d 100644
--- a/WebRTCControlled/app/src/main/res/values/strings.xml
+++ b/WebRTCControlled/app/src/main/res/values/strings.xml
@@ -13,4 +13,6 @@
     <string name="accessibility_dialog_message">当前应用未使用系统签名，也未获取 Root 权限。如需在远程控制时模拟键盘与触摸输入，请前往系统设置开启本应用的无障碍服务。</string>
     <string name="accessibility_dialog_go">去开启</string>
     <string name="accessibility_dialog_cancel">取消</string>
+    <string name="resolution_label">采集分辨率</string>
+    <string name="resolution_changed_message">采集分辨率已切换为 %1$d×%2$d</string>
 </resources>
diff --git a/WebRTCController/app/src/main/java/com/ttstd/controller/MainActivity.java b/WebRTCController/app/src/main/java/com/ttstd/controller/MainActivity.java
index f06cca3..d6aad34 100644
--- a/WebRTCController/app/src/main/java/com/ttstd/controller/MainActivity.java
+++ b/WebRTCController/app/src/main/java/com/ttstd/controller/MainActivity.java
@@ -11,6 +11,13 @@ import android.widget.FrameLayout;
 import android.widget.LinearLayout;
 import android.widget.TextView;
 import android.widget.Toast;
+import android.view.View;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.Spinner;
+
+import java.util.ArrayList;
+import java.util.List;
 
 import androidx.appcompat.app.AppCompatActivity;
 
@@ -47,6 +54,7 @@ public class MainActivity extends AppCompatActivity {
     private LinearLayout setupPanel;
     private TextView tvStatusControl;
     private TextView tvStats;
+    private Spinner spinnerResolution;
 
     private WebSocketClient wsClient;
     private WebRtcClient webRtcClient;
@@ -89,6 +97,7 @@ public class MainActivity extends AppCompatActivity {
         setupPanel = findViewById(R.id.setup_panel);
         tvStatusControl = findViewById(R.id.tv_status_control);
         tvStats = findViewById(R.id.tv_stats);
+        spinnerResolution = findViewById(R.id.spinner_resolution);
 
         // 默认服务器地址
         etServerUrl.setText("ws://175.178.213.60:8088/ws/signal");
@@ -147,6 +156,7 @@ public class MainActivity extends AppCompatActivity {
             }
         });
 
+        setupResolutionSpinner();
         updateUI(false);
     }
 
@@ -458,11 +468,64 @@ public class MainActivity extends AppCompatActivity {
         tvStatus.setText("状态: 已停止");
     }
 
+    /** 分辨率预设（发送给被控端的 SET_RESOLUTION 参数）。 */
+    private static class ResolutionPreset {
+        final String label;
+        final int width;
+        final int height;
+        final int fps;
+
+        ResolutionPreset(String label, int width, int height, int fps) {
+            this.label = label;
+            this.width = width;
+            this.height = height;
+            this.fps = fps;
+        }
+
+        @Override
+        public String toString() {
+            return label;
+        }
+    }
+
+    /** 构建分辨率下拉框，选择后请求被控端切换采集分辨率。 */
+    private void setupResolutionSpinner() {
+        List<ResolutionPreset> presets = new ArrayList<>();
+        presets.add(new ResolutionPreset("原始画质", 0, 0, 0));   // 被控端原生分辨率
+        presets.add(new ResolutionPreset("1080P", 1920, 0, 0));
+        presets.add(new ResolutionPreset("720P", 1280, 0, 0));
+        presets.add(new ResolutionPreset("480P", 854, 0, 0));
+
+        ArrayAdapter<ResolutionPreset> adapter = new ArrayAdapter<>(
+                this, android.R.layout.simple_spinner_item, presets);
+        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
+        spinnerResolution.setAdapter(adapter);
+        spinnerResolution.setSelection(0);
+
+        // 先选中默认项再设置监听，避免初始化即触发一次切换。
+        spinnerResolution.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
+                ResolutionPreset preset = (ResolutionPreset) parent.getItemAtPosition(position);
+                if (webRtcClient != null) {
+                    webRtcClient.requestResolutionChange(preset.width, preset.height, preset.fps);
+                }
+            }
+
+            @Override
+            public void onNothingSelected(AdapterView<?> parent) {
+            }
+        });
+    }
+
     private void updateUI(boolean connected) {
         setupPanel.setVisibility(connected ? View.GONE : View.VISIBLE);
         controlPanel.setVisibility(connected ? View.VISIBLE : View.GONE);
         btnConnect.setEnabled(!connected);
         btnDisconnect.setEnabled(connected);
+        if (spinnerResolution != null) {
+            spinnerResolution.setEnabled(connected);
+        }
         if (tvStatusControl != null) {
             tvStatusControl.setText(connected ? "远程控制中" : "未连接");
         }
diff --git a/WebRTCController/app/src/main/java/com/ttstd/controller/webrtc/WebRtcClient.java b/WebRTCController/app/src/main/java/com/ttstd/controller/webrtc/WebRtcClient.java
index da6c387..0c08a1b 100644
--- a/WebRTCController/app/src/main/java/com/ttstd/controller/webrtc/WebRtcClient.java
+++ b/WebRTCController/app/src/main/java/com/ttstd/controller/webrtc/WebRtcClient.java
@@ -5,6 +5,7 @@ import android.util.Log;
 
 import com.google.gson.Gson;
 import com.google.gson.JsonObject;
+import com.ttstd.control.Action;
 import com.ttstd.controller.signaling.SignalMessage;
 import com.ttstd.controller.signaling.WebSocketClient;
 import com.ttstd.control.ControlMessage;
@@ -239,6 +240,23 @@ public class WebRtcClient {
         }
     }
 
+    /**
+     * 请求被控端切换屏幕采集分辨率（通过 DataChannel 发送 SET_RESOLUTION 指令）。
+     * 语义：width <= 0 表示被控端原生分辨率；height <= 0 时按 width 指定长边依屏幕宽高比缩放；
+     * fps <= 0 表示沿用当前帧率。
+     */
+    public void requestResolutionChange(int width, int height, int fps) {
+        if (dataChannel != null && dataChannel.state() == DataChannel.State.OPEN) {
+            ControlMessage msg = ControlMessage.newBuilder()
+                    .setAction(Action.SET_RESOLUTION)
+                    .setWidth(width)
+                    .setHeight(height)
+                    .setFps(fps)
+                    .build();
+            sendControlCommand(msg);
+        }
+    }
+
     public void close() {
         if (remoteVideoTrack != null && remoteSurfaceView != null) {
             remoteVideoTrack.removeSink(remoteSurfaceView);
diff --git a/WebRTCController/app/src/main/proto/control_message.proto b/WebRTCController/app/src/main/proto/control_message.proto
index e72212d..99c6720 100644
--- a/WebRTCController/app/src/main/proto/control_message.proto
+++ b/WebRTCController/app/src/main/proto/control_message.proto
@@ -13,6 +13,8 @@ enum Action {
   KEY = 3;
   LONG_PRESS = 4;
   MOTION_EVENT = 5;
+  SET_RESOLUTION = 6; // 控制端请求被控端切换屏幕采集分辨率
+  REPORT_RESOLUTION = 7; // 被控端上报当前实际采集分辨率（含连接建立后的初始值）
 }
 
 // 通过 RTCDataChannel 传输的控制指令（protobuf 二进制）。
@@ -38,4 +40,12 @@ message ControlMessage {
 
   // 原始动作（MOTION_EVENT）：对应 Android MotionEvent ACTION_*（0=DOWN 1=UP 2=MOVE）
   int32 motion_action = 11;
+
+  // 分辨率切换（SET_RESOLUTION）：
+  // width 为目标长边/宽度；<=0 表示使用被控端原始（native）分辨率。
+  // height 为目标高度；<=0 时按被控端屏幕宽高比基于 width 计算（保留原始比例）。
+  // fps 为目标帧率；<=0 表示沿用当前帧率。
+  int32 width = 12;
+  int32 height = 13;
+  int32 fps = 14;
 }
diff --git a/WebRTCController/app/src/main/res/layout/activity_main.xml b/WebRTCController/app/src/main/res/layout/activity_main.xml
index 6806094..47e8885 100644
--- a/WebRTCController/app/src/main/res/layout/activity_main.xml
+++ b/WebRTCController/app/src/main/res/layout/activity_main.xml
@@ -136,6 +136,13 @@
                 android:textColor="@android:color/white"
                 android:textSize="12sp" />
 
+            <Spinner
+                android:id="@+id/spinner_resolution"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="4dp"
+                android:backgroundTint="#80FFFFFF" />
+
         </LinearLayout>
 
     </FrameLayout>
diff --git a/WebRTCControllerWeb/public/control_message.proto b/WebRTCControllerWeb/public/control_message.proto
index e72212d..99c6720 100644
--- a/WebRTCControllerWeb/public/control_message.proto
+++ b/WebRTCControllerWeb/public/control_message.proto
@@ -13,6 +13,8 @@ enum Action {
   KEY = 3;
   LONG_PRESS = 4;
   MOTION_EVENT = 5;
+  SET_RESOLUTION = 6; // 控制端请求被控端切换屏幕采集分辨率
+  REPORT_RESOLUTION = 7; // 被控端上报当前实际采集分辨率（含连接建立后的初始值）
 }
 
 // 通过 RTCDataChannel 传输的控制指令（protobuf 二进制）。
@@ -38,4 +40,12 @@ message ControlMessage {
 
   // 原始动作（MOTION_EVENT）：对应 Android MotionEvent ACTION_*（0=DOWN 1=UP 2=MOVE）
   int32 motion_action = 11;
+
+  // 分辨率切换（SET_RESOLUTION）：
+  // width 为目标长边/宽度；<=0 表示使用被控端原始（native）分辨率。
+  // height 为目标高度；<=0 时按被控端屏幕宽高比基于 width 计算（保留原始比例）。
+  // fps 为目标帧率；<=0 表示沿用当前帧率。
+  int32 width = 12;
+  int32 height = 13;
+  int32 fps = 14;
 }
diff --git a/WebRTCControllerWeb/src/components/ControlBar.vue b/WebRTCControllerWeb/src/components/ControlBar.vue
index 2e4e0d4..0adf0f5 100644
--- a/WebRTCControllerWeb/src/components/ControlBar.vue
+++ b/WebRTCControllerWeb/src/components/ControlBar.vue
@@ -1,5 +1,6 @@
 <script setup>
-import { store, sendKey } from '../store/controllerStore';
+import { ref, watch } from 'vue';
+import { store, sendKey, sendResolutionChange } from '../store/controllerStore';
 
 // Android KeyEvent 键值（与被控端 SystemInputUtils 注入一致）
 const keys = [
@@ -12,14 +13,60 @@ const keys = [
   { label: '电源', code: 26 },    // KEYCODE_POWER
 ];
 
+// 分辨率预设：width 为长边像素；0 表示被控端原生分辨率；
+// height 传 0（由被控端按屏幕宽高比自动计算），fps 传 0（沿用当前帧率）。
+const resolutionPresets = [
+  { label: '原始画质', width: 0, height: 0, fps: 0 },
+  { label: '1080P', width: 1920, height: 0, fps: 0 },
+  { label: '720P', width: 1280, height: 0, fps: 0 },
+  { label: '480P', width: 854, height: 0, fps: 0 },
+];
+// 注意：<option :value="p.width"> 的 value 是数字，Vue 的 v-model 会按数字写入，
+// 因此这里也必须用数字（不能用字符串 '0'），否则默认选中项与比较逻辑会类型不一致。
+const selectedResolution = ref(0);
+
 function press(code) {
   if (!store.dataChannelOpen) return;
   sendKey(code);
 }
+
+function onResolutionChange() {
+  if (!store.dataChannelOpen) return;
+  // 统一按数值匹配：v-model 写入的是数字，不能用 String() 再与数字比较。
+  const preset = resolutionPresets.find((p) => p.width === Number(selectedResolution.value));
+  if (preset) {
+    sendResolutionChange(preset.width, preset.height, preset.fps);
+  }
+}
+
+// 被控端上报当前实际采集分辨率时，把下拉框同步到对应预设（避免 UI 与实际不一致）。
+watch(() => store.currentResolution, (res) => {
+  if (!res) return;
+  const longEdge = Math.max(res.width, res.height);
+  const preset = resolutionPresets.find((p) => p.width === longEdge);
+  if (preset) selectedResolution.value = preset.width;
+});
 </script>
 
 <template>
   <div class="control-bar">
+    <div class="resolution-row">
+      <label class="resolution-label">分辨率:</label>
+      <select
+        class="resolution-select"
+        v-model="selectedResolution"
+        :disabled="!store.dataChannelOpen"
+        @change="onResolutionChange"
+      >
+        <option v-for="p in resolutionPresets" :key="p.label" :value="p.width">
+          {{ p.label }}
+        </option>
+      </select>
+      <span class="resolution-current" v-if="store.currentResolution">
+        当前: {{ store.currentResolution.width }}×{{ store.currentResolution.height }}
+      </span>
+    </div>
+
     <button
       v-for="k in keys"
       :key="k.code"
diff --git a/WebRTCControllerWeb/src/proto/controlMessage.js b/WebRTCControllerWeb/src/proto/controlMessage.js
index 916029f..82c302a 100644
--- a/WebRTCControllerWeb/src/proto/controlMessage.js
+++ b/WebRTCControllerWeb/src/proto/controlMessage.js
@@ -13,6 +13,8 @@ export const Action = {
   KEY: 3,
   LONG_PRESS: 4,
   MOTION_EVENT: 5,
+  SET_RESOLUTION: 6,
+  REPORT_RESOLUTION: 7,
 };
 
 export async function loadProto() {
@@ -29,3 +31,9 @@ export function encodeControlMessage(fields) {
   // 返回 Uint8Array，可直接通过 RTCDataChannel.send 发送（二进制）。
   return ControlMessage.encode(message).finish();
 }
+
+/** 解析被控端经 DataChannel 发来的二进制 protobuf（如分辨率上报）。返回消息对象。 */
+export function decodeControlMessage(bytes) {
+  if (!ControlMessage) throw new Error('protobuf 尚未加载，请先调用 loadProto()');
+  return ControlMessage.decode(bytes);
+}
diff --git a/WebRTCControllerWeb/src/services/WebRtcController.js b/WebRTCControllerWeb/src/services/WebRtcController.js
index 6ebf9f1..7f40236 100644
--- a/WebRTCControllerWeb/src/services/WebRtcController.js
+++ b/WebRTCControllerWeb/src/services/WebRtcController.js
@@ -1,4 +1,4 @@
-import { encodeControlMessage } from '../proto/controlMessage';
+import { encodeControlMessage, decodeControlMessage, Action } from '../proto/controlMessage';
 
 // 对应 Android 端 WebRtcClient / Flutter webrtc_controller.dart。
 // 作为 OFFER 方：仅接收远端视频（recvonly）+ 创建控制用 DataChannel，
@@ -6,7 +6,7 @@ import { encodeControlMessage } from '../proto/controlMessage';
 const DATA_CHANNEL_LABEL = 'control_channel';
 
 export class WebRtcController {
-  constructor({ iceServers, deviceId, targetDeviceId, signaling, onIceState, onDataChannelState, onStream, onStats, onError }) {
+  constructor({ iceServers, deviceId, targetDeviceId, signaling, onIceState, onDataChannelState, onStream, onStats, onError, onResolutionReport }) {
     this.iceServers = iceServers;
     this.deviceId = deviceId;
     this.targetDeviceId = targetDeviceId;
@@ -16,6 +16,7 @@ export class WebRtcController {
     this.onStream = onStream;
     this.onStats = onStats;
     this.onError = onError;
+    this.onResolutionReport = onResolutionReport;
 
     this.pc = null;
     this.dataChannel = null;
@@ -96,7 +97,22 @@ export class WebRtcController {
     this.dataChannel = dc;
     dc.onopen = () => this.onDataChannelState && this.onDataChannelState(true);
     dc.onclose = () => this.onDataChannelState && this.onDataChannelState(false);
-    dc.onmessage = (e) => console.debug('[DataChannel] 收到消息', e.data);
+    dc.onmessage = (e) => {
+      try {
+        // 被控端发来的是二进制 protobuf（目前仅 REPORT_RESOLUTION 上报）。
+        const bytes = e.data instanceof ArrayBuffer ? new Uint8Array(e.data) : e.data;
+        const msg = decodeControlMessage(bytes);
+        if (msg && msg.action === Action.REPORT_RESOLUTION) {
+          this.onResolutionReport && this.onResolutionReport({
+            width: msg.width | 0,
+            height: msg.height | 0,
+            fps: msg.fps | 0,
+          });
+        }
+      } catch (err) {
+        console.debug('[DataChannel] 解码消息失败（非分辨率上报或格式异常）', err);
+      }
+    };
   }
 
   async handleAnswer(sdp) {
@@ -147,6 +163,7 @@ export class WebRtcController {
   sendKey(keyCode) { return this.sendControlMessage({ action: 3, keyCode, keyAction: 0 }); } // KEY
   sendLongPress(x, y) { return this.sendControlMessage({ action: 4, x, y }); }        // LONG_PRESS
   sendMotionEvent(action, x, y) { return this.sendControlMessage({ action: 5, motionAction: action, x, y }); } // MOTION_EVENT
+  sendResolutionChange(width, height, fps) { return this.sendControlMessage({ action: 6, width, height, fps }); } // SET_RESOLUTION
 
   _startStats() {
     this._statsTimer = setInterval(async () => {
diff --git a/WebRTCControllerWeb/src/store/controllerStore.js b/WebRTCControllerWeb/src/store/controllerStore.js
index 556a9ab..f696da3 100644
--- a/WebRTCControllerWeb/src/store/controllerStore.js
+++ b/WebRTCControllerWeb/src/store/controllerStore.js
@@ -35,6 +35,8 @@ export const store = reactive({
   controlledDevices: [],
   stats: null,
   remoteStream: null,
+  // 被控端上报的当前实际采集分辨率（宽/高/帧率），用于与分辨率下拉框保持一致。
+  currentResolution: null,
 });
 
 let signaling = null;
@@ -142,6 +144,8 @@ export async function connectToDevice(targetId) {
       onStream: (stream) => { store.remoteStream = markRaw(stream); },
       onStats: (stats) => { store.stats = stats; },
       onError: (msg) => { if (msg) store.error = msg; },
+      // 被控端上报当前实际采集分辨率，同步到 store 供 UI 展示/匹配预设。
+      onResolutionReport: (res) => { store.currentResolution = res; },
     });
     await webrtc.createOffer();
   } catch (e) {
@@ -160,6 +164,7 @@ export async function disconnectDevice() {
   store.dataChannelOpen = false;
   store.remoteStream = null;
   store.stats = null;
+  store.currentResolution = null;
   store.statusText = store.signalingConnected ? '已断开设备连接' : '未连接';
 }
 
@@ -177,3 +182,5 @@ export function sendSwipe(x1, y1, x2, y2, duration) { return webrtc && webrtc.se
 export function sendLongPress(x, y) { return webrtc && webrtc.sendLongPress(x, y); }
 export function sendMotionEvent(action, x, y) { return webrtc && webrtc.sendMotionEvent(action, x, y); }
 export function sendKey(keyCode) { return webrtc && webrtc.sendKey(keyCode); }
+// 请求被控端切换屏幕采集分辨率（width<=0 表示原生分辨率；height<=0 时按 width 长边依宽高比缩放）
+export function sendResolutionChange(width, height, fps) { return webrtc && webrtc.sendResolutionChange(width, height, fps); }
diff --git a/WebRTCControllerWeb/src/style.css b/WebRTCControllerWeb/src/style.css
index f5678cf..dd9b7c3 100644
--- a/WebRTCControllerWeb/src/style.css
+++ b/WebRTCControllerWeb/src/style.css
@@ -161,6 +161,26 @@ body {
 .key-btn:hover { border-color: var(--accent); }
 .key-btn:active { background: var(--accent); }
 
+.resolution-row {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+.resolution-label { font-size: 13px; color: var(--text); font-weight: 600; }
+.resolution-select {
+  padding: 9px 11px;
+  background: var(--panel-2);
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  color: var(--text);
+  font-size: 13px;
+  outline: none;
+  cursor: pointer;
+}
+.resolution-select:focus { border-color: var(--accent); }
+.resolution-select:disabled { opacity: .5; cursor: not-allowed; }
+.resolution-current { font-size: 12px; color: var(--muted); }
+
 .footer { background: var(--panel); border-top: 1px solid var(--border); }
 .stats-bar {
   display: flex;
diff --git a/webrtc_controller_flutter/lib/controller/remote_controller.dart b/webrtc_controller_flutter/lib/controller/remote_controller.dart
index f086a29..dbf481d 100644
--- a/webrtc_controller_flutter/lib/controller/remote_controller.dart
+++ b/webrtc_controller_flutter/lib/controller/remote_controller.dart
@@ -131,6 +131,11 @@ class RemoteController {
     _webRtc?.sendControlCommand(command);
   }
 
+  /// 请求被控端切换屏幕采集分辨率。
+  void sendResolutionChange(int width, int height, int fps) {
+    _webRtc?.sendResolutionChange(width, height, fps);
+  }
+
   /// 断开连接并释放资源。
   Future<void> disconnect() async {
     _statsTimer?.cancel();
diff --git a/webrtc_controller_flutter/lib/main.dart b/webrtc_controller_flutter/lib/main.dart
index 984b840..18a4ac3 100644
--- a/webrtc_controller_flutter/lib/main.dart
+++ b/webrtc_controller_flutter/lib/main.dart
@@ -47,6 +47,16 @@ class _ControllerHomeState extends State<ControllerHome> {
   String _stats = '';
   double _videoAspect = 16 / 9;
 
+  /// 分辨率预设：width 为长边像素；0 表示被控端原生分辨率；
+  /// height 传 0（由被控端按屏幕宽高比计算），fps 传 0（沿用当前帧率）。
+  int _selectedResolution = 0;
+  final List<Map<String, Object>> _resolutionOptions = const [
+    {'label': '原始', 'width': 0, 'height': 0, 'fps': 0},
+    {'label': '1080P', 'width': 1920, 'height': 0, 'fps': 0},
+    {'label': '720P', 'width': 1280, 'height': 0, 'fps': 0},
+    {'label': '480P', 'width': 854, 'height': 0, 'fps': 0},
+  ];
+
   @override
   void initState() {
     super.initState();
@@ -320,6 +330,29 @@ class _ControllerHomeState extends State<ControllerHome> {
             ),
           ),
         ),
+        Positioned(
+          bottom: 16,
+          left: 16,
+          child: CupertinoSegmentedControl<int>(
+            groupValue: _selectedResolution,
+            children: <int, Widget>{
+              for (int i = 0; i < _resolutionOptions.length; i++)
+                i: Padding(
+                  padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 6),
+                  child: Text(_resolutionOptions[i]['label'] as String),
+                ),
+            },
+            onValueChanged: (int idx) {
+              setState(() => _selectedResolution = idx);
+              final o = _resolutionOptions[idx];
+              _controller?.sendResolutionChange(
+                o['width'] as int,
+                o['height'] as int,
+                o['fps'] as int,
+              );
+            },
+          ),
+        ),
       ],
       ),
     );
diff --git a/webrtc_controller_flutter/lib/proto/control_message.pb.dart b/webrtc_controller_flutter/lib/proto/control_message.pb.dart
index 1a87ee6..d2c7538 100644
--- a/webrtc_controller_flutter/lib/proto/control_message.pb.dart
+++ b/webrtc_controller_flutter/lib/proto/control_message.pb.dart
@@ -36,6 +36,9 @@ class ControlMessage extends $pb.GeneratedMessage {
     $core.int? keyCode,
     $core.int? keyAction,
     $core.int? motionAction,
+    $core.int? width,
+    $core.int? height,
+    $core.int? fps,
   }) {
     final result = create();
     if (action != null) result.action = action;
@@ -49,6 +52,9 @@ class ControlMessage extends $pb.GeneratedMessage {
     if (keyCode != null) result.keyCode = keyCode;
     if (keyAction != null) result.keyAction = keyAction;
     if (motionAction != null) result.motionAction = motionAction;
+    if (width != null) result.width = width;
+    if (height != null) result.height = height;
+    if (fps != null) result.fps = fps;
     return result;
   }
 
@@ -77,6 +83,9 @@ class ControlMessage extends $pb.GeneratedMessage {
     ..aI(9, _omitFieldNames ? '' : 'keyCode')
     ..aI(10, _omitFieldNames ? '' : 'keyAction')
     ..aI(11, _omitFieldNames ? '' : 'motionAction')
+    ..aI(12, _omitFieldNames ? '' : 'width')
+    ..aI(13, _omitFieldNames ? '' : 'height')
+    ..aI(14, _omitFieldNames ? '' : 'fps')
     ..hasRequiredFields = false;
 
   @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
@@ -201,6 +210,36 @@ class ControlMessage extends $pb.GeneratedMessage {
   $core.bool hasMotionAction() => $_has(10);
   @$pb.TagNumber(11)
   void clearMotionAction() => $_clearField(11);
+
+  /// 分辨率切换（SET_RESOLUTION）：目标宽度/长边（<=0 表示原生分辨率）
+  @$pb.TagNumber(12)
+  $core.int get width => $_getIZ(11);
+  @$pb.TagNumber(12)
+  set width($core.int value) => $_setSignedInt32(11, value);
+  @$pb.TagNumber(12)
+  $core.bool hasWidth() => $_has(11);
+  @$pb.TagNumber(12)
+  void clearWidth() => $_clearField(12);
+
+  /// 分辨率切换（SET_RESOLUTION）：目标高度（<=0 时按屏幕宽高比基于 width 计算）
+  @$pb.TagNumber(13)
+  $core.int get height => $_getIZ(12);
+  @$pb.TagNumber(13)
+  set height($core.int value) => $_setSignedInt32(12, value);
+  @$pb.TagNumber(13)
+  $core.bool hasHeight() => $_has(12);
+  @$pb.TagNumber(13)
+  void clearHeight() => $_clearField(13);
+
+  /// 分辨率切换（SET_RESOLUTION）：目标帧率（<=0 表示沿用当前帧率）
+  @$pb.TagNumber(14)
+  $core.int get fps => $_getIZ(13);
+  @$pb.TagNumber(14)
+  set fps($core.int value) => $_setSignedInt32(13, value);
+  @$pb.TagNumber(14)
+  $core.bool hasFps() => $_has(13);
+  @$pb.TagNumber(14)
+  void clearFps() => $_clearField(14);
 }
 
 const $core.bool _omitFieldNames =
diff --git a/webrtc_controller_flutter/lib/proto/control_message.pbenum.dart b/webrtc_controller_flutter/lib/proto/control_message.pbenum.dart
index 895dd81..0acf70d 100644
--- a/webrtc_controller_flutter/lib/proto/control_message.pbenum.dart
+++ b/webrtc_controller_flutter/lib/proto/control_message.pbenum.dart
@@ -25,6 +25,10 @@ class Action extends $pb.ProtobufEnum {
       Action._(4, _omitEnumNames ? '' : 'LONG_PRESS');
   static const Action MOTION_EVENT =
       Action._(5, _omitEnumNames ? '' : 'MOTION_EVENT');
+  static const Action SET_RESOLUTION =
+      Action._(6, _omitEnumNames ? '' : 'SET_RESOLUTION');
+  static const Action REPORT_RESOLUTION =
+      Action._(7, _omitEnumNames ? '' : 'REPORT_RESOLUTION');
 
   static const $core.List<Action> values = <Action>[
     ACTION_UNKNOWN,
@@ -33,10 +37,12 @@ class Action extends $pb.ProtobufEnum {
     KEY,
     LONG_PRESS,
     MOTION_EVENT,
+    SET_RESOLUTION,
+    REPORT_RESOLUTION,
   ];
 
   static final $core.List<Action?> _byValue =
-      $pb.ProtobufEnum.$_initByValueList(values, 5);
+      $pb.ProtobufEnum.$_initByValueList(values, 7);
   static Action? valueOf($core.int value) =>
       value < 0 || value >= _byValue.length ? null : _byValue[value];
 
diff --git a/webrtc_controller_flutter/lib/utils/control_commands.dart b/webrtc_controller_flutter/lib/utils/control_commands.dart
index ea7d69d..0a37111 100644
--- a/webrtc_controller_flutter/lib/utils/control_commands.dart
+++ b/webrtc_controller_flutter/lib/utils/control_commands.dart
@@ -56,4 +56,16 @@ class ControlCommands {
         x: x,
         y: y,
       );
+
+  /// 分辨率切换指令。
+  /// [width] 目标长边/宽度（<=0 表示被控端原生分辨率）；
+  /// [height] 目标高度（<=0 时由被控端按屏幕宽高比计算）；
+  /// [fps] 目标帧率（<=0 表示沿用当前帧率）。
+  static ControlMessage setResolution(int width, int height, int fps) =>
+      ControlMessage(
+        action: Action.SET_RESOLUTION,
+        width: width,
+        height: height,
+        fps: fps,
+      );
 }
diff --git a/webrtc_controller_flutter/lib/webrtc/webrtc_controller.dart b/webrtc_controller_flutter/lib/webrtc/webrtc_controller.dart
index 66d9ff6..5d72b40 100644
--- a/webrtc_controller_flutter/lib/webrtc/webrtc_controller.dart
+++ b/webrtc_controller_flutter/lib/webrtc/webrtc_controller.dart
@@ -5,6 +5,7 @@ import '../config/ice_servers.dart';
 import '../models/signal_message.dart';
 import '../proto/control_message.pb.dart';
 import '../signaling/signaling_client.dart';
+import '../utils/control_commands.dart';
 
 /// 封装 WebRTC 连接逻辑（对应 Android 端 WebRtcClient）。
 ///
@@ -192,6 +193,11 @@ class WebRtcController {
     }
   }
 
+  /// 请求被控端切换屏幕采集分辨率（SET_RESOLUTION 指令）。
+  void sendResolutionChange(int width, int height, int fps) {
+    sendControlCommand(ControlCommands.setResolution(width, height, fps));
+  }
+
   /// 上一次统计采样的字节数与时间戳，用于计算每秒网速。
   int _prevBytesReceived = 0;
   int _prevBytesSent = 0;
diff --git a/webrtc_controller_flutter/proto/control_message.proto b/webrtc_controller_flutter/proto/control_message.proto
index e72212d..99c6720 100644
--- a/webrtc_controller_flutter/proto/control_message.proto
+++ b/webrtc_controller_flutter/proto/control_message.proto
@@ -13,6 +13,8 @@ enum Action {
   KEY = 3;
   LONG_PRESS = 4;
   MOTION_EVENT = 5;
+  SET_RESOLUTION = 6; // 控制端请求被控端切换屏幕采集分辨率
+  REPORT_RESOLUTION = 7; // 被控端上报当前实际采集分辨率（含连接建立后的初始值）
 }
 
 // 通过 RTCDataChannel 传输的控制指令（protobuf 二进制）。
@@ -38,4 +40,12 @@ message ControlMessage {
 
   // 原始动作（MOTION_EVENT）：对应 Android MotionEvent ACTION_*（0=DOWN 1=UP 2=MOVE）
   int32 motion_action = 11;
+
+  // 分辨率切换（SET_RESOLUTION）：
+  // width 为目标长边/宽度；<=0 表示使用被控端原始（native）分辨率。
+  // height 为目标高度；<=0 时按被控端屏幕宽高比基于 width 计算（保留原始比例）。
+  // fps 为目标帧率；<=0 表示沿用当前帧率。
+  int32 width = 12;
+  int32 height = 13;
+  int32 fps = 14;
 }