diff --git a/apps/web/src/pages/ai-avatar/AiAvatarPage.tsx b/apps/web/src/pages/ai-avatar/AiAvatarPage.tsx
index d53b49dab..5ffab6867 100644
--- a/apps/web/src/pages/ai-avatar/AiAvatarPage.tsx
+++ b/apps/web/src/pages/ai-avatar/AiAvatarPage.tsx
@@ -13,7 +13,13 @@ import PanelTitleConfig from "./components/PanelTitleConfig"
 import PanelCoverAndGenerate from "./components/PanelCoverAndGenerate"
 import { ModalAssetPicker } from "./components/ModalAssetPicker"
 import ModalBRollEditor from "./components/ModalBRollEditor"
-import { getScripts, createLipsyncJob, getLipsyncJob, submitRender } from "./api/aiAvatar"
+import {
+  getScripts,
+  getAssetById,
+  createLipsyncJob,
+  getLipsyncJob,
+  submitRender,
+} from "./api/aiAvatar"
 
 /** 面板折叠状态 */
 type PanelKey = "video" | "voice" | "script" | "title" | "cover"
@@ -50,10 +56,18 @@ const AiAvatarPage: React.FC = () => {
       return
     }
     try {
+      // ① 先按素材 id 拿 file_url（#1809 补充：对齐后端新参数 video_url）
+      const asset = await getAssetById(video.id)
+      const videoUrl = asset?.file_url
+      if (!videoUrl) {
+        message.error("获取出镜视频播放地址失败，请重新选择素材")
+        return
+      }
+      // ② voice_id（预设/克隆 UUID 均由后端内部调 TTS）+ script_text + video_url
       const job = await createLipsyncJob({
         voice_id: voice.voice_id,
         script_text: state.scriptText,
-        video_asset_id: video.id,
+        video_url: videoUrl,
       })
       state.setLipsyncJob(job)
       message.success("对口型任务已提交，生成中…")
diff --git a/apps/web/src/pages/ai-avatar/api/aiAvatar.ts b/apps/web/src/pages/ai-avatar/api/aiAvatar.ts
index c84904f4f..75704c47c 100644
--- a/apps/web/src/pages/ai-avatar/api/aiAvatar.ts
+++ b/apps/web/src/pages/ai-avatar/api/aiAvatar.ts
@@ -28,11 +28,17 @@ export const deleteScript = async (id: string): Promise<void> => {
   await apiClient.delete(`/scripts/${id}`)
 }
 
+/* ── 素材单查（用于拿到 file_url 传给对口型等新接口） ── */
+export const getAssetById = async (id: string): Promise<{ file_url?: string; id: string }> => {
+  const response = await apiClient.get<{ file_url?: string; id: string }>(`/assets/${id}`)
+  return response.data
+}
+
 /* ── 对口型 ── */
 export const createLipsyncJob = async (data: {
   voice_id: string
   script_text: string
-  video_asset_id: string
+  video_url: string
 }): Promise<LipsyncJob> => {
   const response = await apiClient.post<LipsyncJob>("/lipsync/jobs", data)
   return response.data