diff --git a/backend/api/routes/video.py b/backend/api/routes/video.py
index 528733e..4371ab3 100644
--- a/backend/api/routes/video.py
+++ b/backend/api/routes/video.py
@@ -1,10 +1,13 @@
-from fastapi import APIRouter, HTTPException
+from fastapi import APIRouter, HTTPException, Depends
 from typing import List, Optional
+from sqlalchemy.orm import Session
 from backend.models.schemas import (
-    Scene, NovelProject, 
+    Scene, NovelProject, DialogueLine,
     VideoFromAssetsRequest, VideoFromAssetsResponse,
     VideoComposeRequest
 )
+from backend.models.database import Scene as DBScene, Project, Dialogue
+from backend.database import get_db
 from backend.services.video_composition.service import VideoCompositionService
 
 router = APIRouter()
@@ -12,11 +15,57 @@
 
 
 @router.post("/compose")
-async def compose_video(request: VideoComposeRequest):
+async def compose_video(request: VideoComposeRequest, db: Session = Depends(get_db)):
     try:
+        project = db.query(Project).filter(Project.id == request.project_id).first()
+        if not project:
+            raise HTTPException(status_code=404, detail="项目不存在")
+        
+        db_scenes = db.query(DBScene).filter(
+            DBScene.project_id == request.project_id
+        ).order_by(DBScene.sequence).all()
+        
+        if not db_scenes:
+            raise HTTPException(status_code=404, detail="该项目没有场景数据")
+        
+        scenes = []
+        for db_scene in db_scenes:
+            dialogues = db.query(Dialogue).filter(
+                Dialogue.scene_id == db_scene.id,
+                Dialogue.project_id == request.project_id
+            ).order_by(Dialogue.sequence).all()
+            
+            lines = [
+                DialogueLine(
+                    character=dialogue.character,
+                    text=dialogue.text,
+                    emotion=dialogue.emotion or "neutral",
+                    is_monologue=dialogue.is_monologue or False,
+                    audio_url=None
+                )
+                for dialogue in dialogues
+            ]
+            
+            scene = Scene(
+                id=str(db_scene.id),
+                sequence=db_scene.sequence,
+                description=db_scene.description or "",
+                dialogue=db_scene.dialogue,
+                narrator_text=None,
+                characters=db_scene.characters or [],
+                setting=db_scene.setting or "",
+                mood=db_scene.mood or "",
+                image_prompt=db_scene.image_prompt,
+                image_url=db_scene.image_url,
+                audio_url=db_scene.audio_url,
+                duration=float(db_scene.duration) if db_scene.duration else 5.0,
+                lines=lines
+            )
+            scenes.append(scene)
+        
         video_path = video_service.generate_video_from_scenes(
-            scenes=request.scenes,
-            project_title=request.project_title,
+            scenes=scenes,
+            project_title=project.title,
             add_bgm=request.add_bgm,
             bgm_path=request.bgm_path,
         )
@@ -25,6 +74,8 @@ async def compose_video(request: VideoComposeRequest):
             "success": True,
             "video_path": video_path,
         }
+    except HTTPException:
+        raise
     except Exception as e:
         raise HTTPException(status_code=500, detail=str(e))
 
diff --git a/backend/models/schemas.py b/backend/models/schemas.py
index 1b4fa32..c44332e 100644
--- a/backend/models/schemas.py
+++ b/backend/models/schemas.py
@@ -230,7 +230,6 @@ class VideoFromAssetsResponse(BaseModel):
 
 
 class VideoComposeRequest(BaseModel):
-    scenes: List[Scene]
-    project_title: str
+    project_id: str
     add_bgm: bool = False
     bgm_path: Optional[str] = None