diff --git a/backend/internal/service/provider.go b/backend/internal/service/provider.go
index 44acf6074..3191eb950 100644
--- a/backend/internal/service/provider.go
+++ b/backend/internal/service/provider.go
@@ -1655,10 +1655,11 @@ func seedanceVideosBody(input canvasGenerationInput) (map[string]interface{}, er
 		return nil, errors.New("Seedance 参考视频或参考音频需要同时连接至少 1 张主参考图")
 	}
 	body := map[string]interface{}{
-		"model":        input.Config.Model,
-		"prompt":       seedanceVideosPromptText(input),
-		"aspect_ratio": normalizeSeedanceVideosRatio(input.Config.Size),
-		"duration":     normalizeSeedanceVideosDuration(input.Config.VideoSeconds),
+		"model":          input.Config.Model,
+		"prompt":         seedanceVideosPromptText(input),
+		"aspect_ratio":   normalizeSeedanceVideosRatio(input.Config.Size),
+		"duration":       normalizeSeedanceVideosDuration(input.Config.VideoSeconds),
+		"generate_audio": parseBool(input.Config.VideoGenerateAudio, true),
 	}
 	imageURLs := make([]string, 0, len(input.ReferenceImages))
 	for _, image := range input.ReferenceImages {
diff --git a/backend/internal/service/provider_test.go b/backend/internal/service/provider_test.go
index 52a098fe7..29f7285f0 100644
--- a/backend/internal/service/provider_test.go
+++ b/backend/internal/service/provider_test.go
@@ -160,9 +160,10 @@ func TestSeedanceVideosBodyUsesVideosEndpointFields(t *testing.T) {
 	body, err := seedanceVideosBody(canvasGenerationInput{
 		Prompt: "make it move",
 		Config: providerConfig{
-			Model:        "seedance-2.0-mini-480p",
-			Size:         "9:16",
-			VideoSeconds: "8",
+			Model:              "seedance-2.0-mini-480p",
+			Size:               "9:16",
+			VideoSeconds:       "8",
+			VideoGenerateAudio: "true",
 		},
 		ReferenceImages: []providerMedia{
 			{ID: "image-1", DataURL: testReferenceImageDataURL},
@@ -180,6 +181,9 @@ func TestSeedanceVideosBodyUsesVideosEndpointFields(t *testing.T) {
 	if body["aspect_ratio"] != "9:16" || body["duration"] != 8 {
 		t.Fatalf("size fields = %#v %#v", body["aspect_ratio"], body["duration"])
 	}
+	if body["generate_audio"] != true {
+		t.Fatalf("generate_audio = %#v, want true", body["generate_audio"])
+	}
 	if body["image_url"] != testReferenceImageDataURL {
 		t.Fatalf("image_url = %#v", body["image_url"])
 	}
@@ -200,6 +204,34 @@ func TestSeedanceVideosBodyUsesVideosEndpointFields(t *testing.T) {
 	}
 }
 
+func TestSeedanceVideosBodyHonorsGenerateAudio(t *testing.T) {
+	for _, test := range []struct {
+		name  string
+		value string
+		want  bool
+	}{
+		{name: "default enabled", want: true},
+		{name: "explicit enabled", value: "true", want: true},
+		{name: "explicit disabled", value: "false", want: false},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			body, err := seedanceVideosBody(canvasGenerationInput{
+				Prompt: "make it move",
+				Config: providerConfig{
+					Model:              "seedance-2.0-mini-480p",
+					VideoGenerateAudio: test.value,
+				},
+			})
+			if err != nil {
+				t.Fatalf("seedanceVideosBody() error = %v", err)
+			}
+			if body["generate_audio"] != test.want {
+				t.Fatalf("generate_audio = %#v, want %v", body["generate_audio"], test.want)
+			}
+		})
+	}
+}
+
 func TestSeedanceVideosBodyUsesOrderedFrameImageURLsWhenConfigured(t *testing.T) {
 	body, err := seedanceVideosBody(canvasGenerationInput{
 		Prompt: "make it move",
diff --git a/web/src/services/api/video.ts b/web/src/services/api/video.ts
index e2a76470d..f9ec72ae1 100644
--- a/web/src/services/api/video.ts
+++ b/web/src/services/api/video.ts
@@ -225,6 +225,7 @@ async function buildSeedanceVideosPayload(config: AiConfig, model: string, promp
         prompt: buildSeedanceVideosPromptText(prompt, imageUrls.length, videoUrls.length, audioUrls.length),
         aspect_ratio: ratio === "adaptive" ? "16:9" : ratio,
         duration: duration < 4 ? 5 : duration,
+        generate_audio: boolConfig(config.videoGenerateAudio, true),
         ...(imageUrls[0] ? { image_url: imageUrls[0] } : {}),
         ...(imageUrls.length > 1 ? { reference_image_urls: imageUrls.slice(1) } : {}),
         ...(videoUrls.length ? { reference_videos: videoUrls } : {}),