diff --git a/apps/web/src/pages/generate/hooks/useGenerateVideo.ts b/apps/web/src/pages/generate/hooks/useGenerateVideo.ts
index 57492b7d4..1b002a421 100755
--- a/apps/web/src/pages/generate/hooks/useGenerateVideo.ts
+++ b/apps/web/src/pages/generate/hooks/useGenerateVideo.ts
@@ -71,9 +71,12 @@ export function useGenerateVideo(props: UseGenerateVideoProps) {
       // 封面 URL：优先 AI 生成缩略图，兜底用户上传
       const coverUrl = props.coverSettings?.thumbnail_url || props.coverSettings?.upload_url || ""
 
-      // 解析配音参数：voiceMode=clone 时用 selectedClonedVoice，否则用 selectedVoice
+      // 解析配音参数：voice_library_id 是配音素材库 asset ID
+      // 优先用当前 voiceMode 对应的选择，兜底用 selectedVoice（防止 voiceMode 切换后丢失）
       const voiceLibraryId =
-        props.voiceMode === "clone" ? props.selectedClonedVoice || "" : props.selectedVoice || ""
+        props.voiceMode === "clone"
+          ? props.selectedClonedVoice || props.selectedVoice || ""
+          : props.selectedVoice || ""
 
       // 创建生成任务（服务器渲染）
       const taskResp = await createGenerationTask({
@@ -85,8 +88,9 @@ export function useGenerateVideo(props: UseGenerateVideoProps) {
         custom_title: props.titleSettings?.title || "",
         duration: props.duration || undefined,
         video_ratio: props.videoRatio,
-        // 配音：优先用 voice_library_id（配音素材库 asset），兜底 voice_ids
-        ...(voiceLibraryId ? { voice_library_id: voiceLibraryId } : {}),
+        // 配音：始终传递 voice_library_id，确保后端能正确接收
+        voice_library_id: voiceLibraryId,
+        // 兜底：如果 voice_library_id 为空但 selectedVoice 有值，也传 voice_ids
         ...(props.selectedVoice && !voiceLibraryId ? { voice_ids: [props.selectedVoice] } : {}),
         // BGM 配置：受 bgm 开关控制，enabled=false 时也显式传覆盖模板 BGM
         bgm_config: {
diff --git a/apps/web/src/pages/generate/hooks/useStep6Cover.ts b/apps/web/src/pages/generate/hooks/useStep6Cover.ts
index 26fdd1241..79fba4fc9 100644
--- a/apps/web/src/pages/generate/hooks/useStep6Cover.ts
+++ b/apps/web/src/pages/generate/hooks/useStep6Cover.ts
@@ -178,13 +178,15 @@ export function useStep6Cover({
           previewParamsRef.current = JSON.stringify({ selectedTemplate, assetIds, titleSettings })
           // 解析配音参数：voiceMode=clone 时用 selectedClonedVoice，否则用 selectedVoice
           const previewVoiceLibraryId =
-            voiceMode === "clone" ? selectedClonedVoice || "" : selectedVoice || ""
+            voiceMode === "clone" ? selectedClonedVoice || selectedVoice || "" : selectedVoice || ""
           const previewResp = await createPreview({
             template_id: selectedTemplate,
             asset_ids: assetIds,
             duration: duration || 30,
-            // 配音：voice_library_id 是配音素材库 asset ID（用户上传的音频或 AI 配音）
-            ...(previewVoiceLibraryId ? { voice_library_id: previewVoiceLibraryId } : {}),
+            // 配音：始终传递 voice_library_id，确保后端能正确接收
+            voice_library_id: previewVoiceLibraryId,
+            // 兜底：如果 voice_library_id 为空但 selectedVoice 有值，也传 voice_ids
+            ...(selectedVoice && !previewVoiceLibraryId ? { voice_ids: [selectedVoice] } : {}),
             // BGM 配置：受 bgm 开关控制
             bgm_config: {
               enabled: bgm !== false,