diff --git a/src/App.vue b/src/App.vue
index 4317cd94..dca8b3a9 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -27,6 +27,8 @@ const watermarkContent = appConfig.name;
 
 // 明亮/暗黑主题水印字体颜色适配
 const fontColor = computed(() => {
-  return settingsStore.theme === ThemeMode.DARK ? "rgba(255, 255, 255, .15)" : "rgba(0, 0, 0, .15)";
+  return settingsStore.resolvedTheme === ThemeMode.DARK
+    ? "rgba(255, 255, 255, .15)"
+    : "rgba(0, 0, 0, .15)";
 });
 </script>
diff --git a/src/components/Hamburger/index.vue b/src/components/Hamburger/index.vue
index 6b63a2e0..832b054a 100644
--- a/src/components/Hamburger/index.vue
+++ b/src/components/Hamburger/index.vue
@@ -19,7 +19,7 @@ const layout = computed(() => settingsStore.layout);
 
 const hamburgerClass = computed(() => {
   // 如果暗黑主题
-  if (settingsStore.theme === ThemeMode.DARK) {
+  if (settingsStore.resolvedTheme === ThemeMode.DARK) {
     return "hamburger--white";
   }
 
diff --git a/src/components/ThemeSwitch/index.vue b/src/components/ThemeSwitch/index.vue
index 019e35fb..379dfb8f 100644
--- a/src/components/ThemeSwitch/index.vue
+++ b/src/components/ThemeSwitch/index.vue
@@ -1,7 +1,7 @@
 <template>
   <el-dropdown trigger="click" @command="handleDarkChange">
     <el-icon :size="20">
-      <component :is="settingsStore.theme === ThemeMode.DARK ? Moon : Sunny" />
+      <component :is="currentThemeIcon" />
     </el-icon>
     <template #dropdown>
       <el-dropdown-menu>
@@ -34,6 +34,14 @@ const theneList = [
   { label: t("login.auto"), value: ThemeMode.AUTO, component: Monitor },
 ];
 
+const currentThemeIcon = computed(() => {
+  if (settingsStore.theme === ThemeMode.AUTO) {
+    return Monitor;
+  }
+
+  return settingsStore.resolvedTheme === ThemeMode.DARK ? Moon : Sunny;
+});
+
 const handleDarkChange = (theme: ThemeMode) => {
   settingsStore.theme = theme;
 };
diff --git a/src/layouts/MixLayout.vue b/src/layouts/MixLayout.vue
index cd4113af..520e91a1 100644
--- a/src/layouts/MixLayout.vue
+++ b/src/layouts/MixLayout.vue
@@ -77,7 +77,7 @@ import { useLayout } from "./useLayout";
 import { useAppStore, usePermissionStore, useSettingsStore } from "@/stores";
 import { isExternal } from "@/utils/index";
 import { translateRouteTitle } from "@/lang/utils";
-import { SidebarColor } from "@/enums/settings";
+import { SidebarColor, ThemeMode } from "@/enums/settings";
 import { ElIcon } from "element-plus";
 import BaseLayout from "./BaseLayout.vue";
 import LayoutLogo from "./components/LayoutLogo.vue";
@@ -127,7 +127,8 @@ const isLogoCollapsed = computed(() => width.value < 768);
 // 是否使用深色菜单配色（暗色主题或经典蓝侧边栏）
 const useMenuColors = computed(
   () =>
-    settingsStore.theme === "dark" || settingsStore.sidebarColorScheme === SidebarColor.CLASSIC_BLUE
+    settingsStore.resolvedTheme === ThemeMode.DARK ||
+    settingsStore.sidebarColorScheme === SidebarColor.CLASSIC_BLUE
 );
 
 // 顶部菜单项（处理单子菜单显示优化）
diff --git a/src/layouts/components/LayoutSettings.vue b/src/layouts/components/LayoutSettings.vue
index 69eeac99..99c4fbaa 100644
--- a/src/layouts/components/LayoutSettings.vue
+++ b/src/layouts/components/LayoutSettings.vue
@@ -11,13 +11,17 @@
         <el-divider>{{ t("settings.theme") }}</el-divider>
 
         <div class="flex-center">
-          <el-switch
-            v-model="isDark"
-            active-icon="Moon"
-            inactive-icon="Sunny"
-            class="theme-switch"
-            @change="handleThemeChange"
-          />
+          <el-radio-group v-model="themeMode" class="theme-mode-group">
+            <el-radio-button :value="ThemeMode.LIGHT">
+              {{ t("login.light") }}
+            </el-radio-button>
+            <el-radio-button :value="ThemeMode.DARK">
+              {{ t("login.dark") }}
+            </el-radio-button>
+            <el-radio-button :value="ThemeMode.AUTO">
+              {{ t("login.auto") }}
+            </el-radio-button>
+          </el-radio-group>
         </div>
       </section>
 
@@ -71,7 +75,10 @@
           <el-switch v-model="settingsStore.colorWeak" />
         </div>
 
-        <div v-if="!isDark" class="config-item flex-x-between">
+        <div
+          v-if="settingsStore.resolvedTheme !== ThemeMode.DARK"
+          class="config-item flex-x-between"
+        >
           <span class="text-xs">{{ t("settings.sidebarColorScheme") }}</span>
           <el-radio-group v-model="sidebarColor" @change="changeSidebarColor">
             <el-radio :value="SidebarColor.CLASSIC_BLUE">
@@ -199,8 +206,13 @@ const colorPresets = [...themeColorPresets];
 
 const settingsStore = useSettingsStore();
 
-const isDark = ref<boolean>(settingsStore.theme === ThemeMode.DARK);
 const sidebarColor = ref(settingsStore.sidebarColorScheme);
+const themeMode = computed({
+  get: () => settingsStore.theme,
+  set: (value: ThemeMode) => {
+    settingsStore.theme = value;
+  },
+});
 
 const selectedThemeColor = computed({
   get: () => settingsStore.themeColor,
@@ -214,15 +226,6 @@ const drawerVisible = computed({
   set: (value) => (settingsStore.settingsVisible = value),
 });
 
-/**
- * 处理主题切换
- *
- * @param isDark 是否启用暗黑模式
- */
-const handleThemeChange = (isDark: string | number | boolean) => {
-  settingsStore.theme = isDark ? ThemeMode.DARK : ThemeMode.LIGHT;
-};
-
 /**
  * 更改侧边栏颜色
  *
@@ -277,8 +280,6 @@ const handleResetSettings = async () => {
   try {
     settingsStore.resetSettings();
 
-    // 同步更新本地状态"
-    isDark.value = settingsStore.theme === ThemeMode.DARK;
     sidebarColor.value = settingsStore.sidebarColorScheme;
 
     ElMessage.success(t("settings.resetSuccess"));
diff --git a/src/layouts/components/LayoutSidebar.vue b/src/layouts/components/LayoutSidebar.vue
index 97acbdc7..62240b78 100644
--- a/src/layouts/components/LayoutSidebar.vue
+++ b/src/layouts/components/LayoutSidebar.vue
@@ -29,7 +29,7 @@ import { useRoute } from "vue-router";
 import path from "path-browserify";
 import type { MenuInstance } from "element-plus";
 import type { RouteRecordRaw } from "vue-router";
-import { SidebarColor } from "@/enums/settings";
+import { SidebarColor, ThemeMode } from "@/enums/settings";
 import { useSettingsStore, useAppStore } from "@/stores";
 import { isExternal } from "@/utils/index";
 import LayoutSidebarItem from "./LayoutSidebarItem.vue";
@@ -61,7 +61,7 @@ const currentRoute = useRoute();
 const expandedMenuIndexes = ref<string[]>([]);
 
 // 获取主题
-const theme = computed(() => settingsStore.theme);
+const theme = computed(() => settingsStore.resolvedTheme);
 
 // 获取浅色主题下的侧边栏配色方案
 const sidebarColorScheme = computed(() => settingsStore.sidebarColorScheme);
@@ -69,7 +69,7 @@ const sidebarColorScheme = computed(() => settingsStore.sidebarColorScheme);
 // 菜单主题属性
 const menuThemeProps = computed(() => {
   const isDarkOrClassicBlue =
-    theme.value === "dark" || sidebarColorScheme.value === SidebarColor.CLASSIC_BLUE;
+    theme.value === ThemeMode.DARK || sidebarColorScheme.value === SidebarColor.CLASSIC_BLUE;
 
   return {
     backgroundColor: isDarkOrClassicBlue ? variables["menu-background"] : undefined,
diff --git a/src/layouts/components/LayoutToolbar.vue b/src/layouts/components/LayoutToolbar.vue
index 88af8bac..0d47c43f 100644
--- a/src/layouts/components/LayoutToolbar.vue
+++ b/src/layouts/components/LayoutToolbar.vue
@@ -125,15 +125,15 @@ function handleProfileClick() {
 
 // 根据主题和侧边栏配色方案选择样式类
 const navbarActionsClass = computed(() => {
-  const { theme, sidebarColorScheme, layout } = settingStore;
+  const { resolvedTheme, sidebarColorScheme, layout } = settingStore;
 
   // 暗黑主题下，所有布局都使用白色文字
-  if (theme === ThemeMode.DARK) {
+  if (resolvedTheme === ThemeMode.DARK) {
     return "navbar-actions--white-text";
   }
 
   // 明亮主题下
-  if (theme === ThemeMode.LIGHT) {
+  if (resolvedTheme === ThemeMode.LIGHT) {
     // 顶部布局和混合布局的顶部区域：
     // - 如果侧边栏是经典蓝色，使用白色文字
     // - 如果侧边栏是极简白色，使用深色文字
diff --git a/src/stores/settings.ts b/src/stores/settings.ts
index a3e11a0b..81642880 100644
--- a/src/stores/settings.ts
+++ b/src/stores/settings.ts
@@ -1,6 +1,13 @@
 import { SidebarColor, ThemeMode } from "@/enums";
 import type { LayoutMode } from "@/enums";
-import { applyTheme, generateThemeColors, toggleDarkMode, toggleSidebarColor } from "@/utils/theme";
+import {
+  applyTheme,
+  generateThemeColors,
+  resolveThemeMode,
+  toggleDarkMode,
+  toggleSidebarColor,
+  watchSystemTheme,
+} from "@/utils/theme";
 import { STORAGE_KEYS } from "@/constants";
 import { defaults } from "@/settings";
 
@@ -25,14 +32,34 @@ export const useSettingsStore = defineStore("setting", () => {
   // 主题
   const theme = useStorage<ThemeMode>(STORAGE_KEYS.THEME, defaults.theme);
   const themeColor = useStorage(STORAGE_KEYS.THEME_COLOR, defaults.themeColor);
+  const resolvedTheme = ref<ThemeMode>(resolveThemeMode(theme.value));
 
   // 特殊模式
   const grayMode = useStorage(STORAGE_KEYS.GRAY_MODE, false);
   const colorWeak = useStorage(STORAGE_KEYS.COLOR_WEAK, false);
 
   // 主题变化监听
+  let stopWatchingSystemTheme: (() => void) | undefined;
+
   watch(
-    [theme, themeColor],
+    theme,
+    (value) => {
+      stopWatchingSystemTheme?.();
+      resolvedTheme.value = resolveThemeMode(value);
+
+      if (value === ThemeMode.AUTO) {
+        stopWatchingSystemTheme = watchSystemTheme((systemTheme) => {
+          resolvedTheme.value = systemTheme;
+        });
+      } else {
+        stopWatchingSystemTheme = undefined;
+      }
+    },
+    { immediate: true }
+  );
+
+  watch(
+    [resolvedTheme, themeColor],
     ([t, c]: [ThemeMode, string]) => {
       toggleDarkMode(t === ThemeMode.DARK);
       applyTheme(generateThemeColors(c, t));
@@ -87,6 +114,7 @@ export const useSettingsStore = defineStore("setting", () => {
     layout,
     themeColor,
     theme,
+    resolvedTheme,
     resetSettings,
   };
 });
diff --git a/src/utils/theme.ts b/src/utils/theme.ts
index e4aa3561..9ac63241 100644
--- a/src/utils/theme.ts
+++ b/src/utils/theme.ts
@@ -1,5 +1,7 @@
 import { ThemeMode } from "@/enums";
 
+const SYSTEM_DARK_MEDIA = "(prefers-color-scheme: dark)";
+
 // 辅助函数：将十六进制颜色转换为 RGB
 function hexToRgb(hex: string): [number, number, number] {
   const bigint = parseInt(hex.slice(1), 16);
@@ -52,6 +54,7 @@ export const getLightColor = (color: string, level: number): string => {
  * @param theme 主题类型
  */
 export function generateThemeColors(primary: string, theme: ThemeMode) {
+  const resolvedTheme = resolveThemeMode(theme);
   const colors: Record<string, string> = {
     primary,
   };
@@ -59,18 +62,39 @@ export function generateThemeColors(primary: string, theme: ThemeMode) {
   // 生成浅色变体
   for (let i = 1; i <= 9; i++) {
     colors[`primary-light-${i}`] =
-      theme === ThemeMode.LIGHT
+      resolvedTheme === ThemeMode.LIGHT
         ? `${getLightColor(primary, i / 10)}`
         : `${getDarkColor(primary, i / 10)}`;
   }
 
   // 生成深色变体
   colors["primary-dark-2"] =
-    theme === ThemeMode.LIGHT ? `${getLightColor(primary, 0.2)}` : `${getDarkColor(primary, 0.3)}`;
+    resolvedTheme === ThemeMode.LIGHT
+      ? `${getLightColor(primary, 0.2)}`
+      : `${getDarkColor(primary, 0.3)}`;
 
   return colors;
 }
 
+export function getSystemTheme() {
+  return window.matchMedia(SYSTEM_DARK_MEDIA).matches ? ThemeMode.DARK : ThemeMode.LIGHT;
+}
+
+export function resolveThemeMode(theme: ThemeMode) {
+  return theme === ThemeMode.AUTO ? getSystemTheme() : theme;
+}
+
+export function watchSystemTheme(callback: (theme: ThemeMode) => void) {
+  const mediaQuery = window.matchMedia(SYSTEM_DARK_MEDIA);
+  const handler = () => callback(mediaQuery.matches ? ThemeMode.DARK : ThemeMode.LIGHT);
+
+  mediaQuery.addEventListener("change", handler);
+
+  return () => {
+    mediaQuery.removeEventListener("change", handler);
+  };
+}
+
 export function applyTheme(colors: Record<string, string>) {
   const el = document.documentElement;