diff --git a/backend/internal/service/provider.go b/backend/internal/service/provider.go
index 19e5dd6fb..cfa8d1dea 100644
--- a/backend/internal/service/provider.go
+++ b/backend/internal/service/provider.go
@@ -1724,6 +1724,10 @@ func newAPIChannel2VideoRequestBody(input canvasGenerationInput) (newAPIVideoReq
 	if len(input.ReferenceImages) > 9 || len(input.ReferenceVideos) > 3 || len(input.ReferenceAudios) > 3 {
 		return newAPIVideoRequest{}, errors.New("NewAPI Video Generations 最多支持 9 张参考图、3 个参考视频和 3 个参考音频")
 	}
+	// NewAPI Video Generations 只接受附着在参考视频上的音频；纯音频请求会被上游拒绝。
+	if len(input.ReferenceAudios) > 0 && len(input.ReferenceVideos) == 0 {
+		return newAPIVideoRequest{}, errors.New("NewAPI Video Generations 的参考音频必须同时提供至少 1 个参考视频；纯音频生视频请切换到支持该模式的渠道")
+	}
 	modelName := strings.ToLower(strings.TrimSpace(input.Config.Model))
 	requiresSingleImage := modelName == "grok-video-1.5" || modelName == "grok-video-1.5-1080p"
 	images := make([]string, 0, len(input.ReferenceImages))
diff --git a/backend/internal/service/provider_test.go b/backend/internal/service/provider_test.go
index 4e0c217c9..78ee34f3e 100644
--- a/backend/internal/service/provider_test.go
+++ b/backend/internal/service/provider_test.go
@@ -1064,6 +1064,16 @@ func TestNewAPIChannel2SingleImageModelsRequireOneReference(t *testing.T) {
 	}
 }
 
+func TestNewAPIChannel2RejectsAudioWithoutReferenceVideo(t *testing.T) {
+	_, err := newAPIChannel2VideoRequestBody(canvasGenerationInput{
+		Config:          providerConfig{Model: "grok-image-video", VideoSeconds: "6"},
+		ReferenceAudios: []providerMedia{{ID: "audio-1", URL: "https://example.com/reference.mp3"}},
+	})
+	if err == nil || !strings.Contains(err.Error(), "必须同时提供至少 1 个参考视频") {
+		t.Fatalf("newAPIChannel2VideoRequestBody() error = %v", err)
+	}
+}
+
 func TestNewAPIChannel2SingleImageModelUsesReferenceForStaleTextToVideoMetadata(t *testing.T) {
 	body, err := newAPIChannel2VideoRequestBody(canvasGenerationInput{
 		Config:          providerConfig{Model: "grok-video-1.5", VideoSeconds: "6"},
diff --git a/web/src/services/api/video.ts b/web/src/services/api/video.ts
index 64d894749..d941784e1 100644
--- a/web/src/services/api/video.ts
+++ b/web/src/services/api/video.ts
@@ -105,6 +105,7 @@ export async function pollVideoGenerationTask(config: AiConfig, task: VideoGener
 
 async function createVideoGenerationsTask(config: ResolvedAiConfig, model: string, prompt: string, references: ReferenceImage[], videoReferences: ReferenceVideo[], audioReferences: ReferenceAudio[], options?: RequestOptions): Promise<VideoGenerationTask> {
     if (references.length > 9 || videoReferences.length > 3 || audioReferences.length > 3) throw new Error("NewAPI Video Generations 最多支持 9 张参考图、3 个参考视频和 3 个参考音频");
+    if (audioReferences.length > 0 && videoReferences.length === 0) throw new Error("NewAPI Video Generations 的参考音频必须同时提供至少 1 个参考视频；纯音频生视频请切换到支持该模式的渠道");
     const [imageUrls, videoUrls, audioUrls] = await Promise.all([
         Promise.all(references.map((item) => resolveVideoGenerationsUrl(item.url || item.dataUrl, item.storageKey))),
         Promise.all(videoReferences.map((item) => resolveVideoGenerationsUrl(item.url, item.storageKey))),