diff --git a/apps/api/app/api/routes/templates_editor/ai_features.py b/apps/api/app/api/routes/templates_editor/ai_features.py
index 6550351fd..626d1b588 100755
--- a/apps/api/app/api/routes/templates_editor/ai_features.py
+++ b/apps/api/app/api/routes/templates_editor/ai_features.py
@@ -24,6 +24,91 @@ logger = logging.getLogger(__name__)
 router = APIRouter(tags=["Template Editor"])
 
 
+def _build_asset_analyses(
+    asset_ids: list[str],
+    db: Session,
+) -> dict[str, str]:
+    """调用 MediaKit 视频理解，返回 {asset_id: 分析文本}.
+
+    如果 MediaKit 不可用或分析失败，返回空 dict（调用方降级处理）。
+    """
+    if not asset_ids:
+        return {}
+
+    try:
+        from packages.adapters.sqlalchemy_impl.asset_repository import SQLAlchemyAssetRepository
+        from packages.shared.mediakit_client import get_mediakit_client
+        from packages.shared.storage import get_shared_storage_service
+
+        client = get_mediakit_client()
+        if not client.is_available:
+            logger.info("MediaKit 未配置，跳过视频理解分析")
+            return {}
+
+        asset_repo = SQLAlchemyAssetRepository(db)
+        storage_svc = get_shared_storage_service()
+
+        # 查找素材并获取下载 URL
+        video_urls: list[str] = []
+        url_to_asset_id: dict[str, str] = {}
+
+        for aid in asset_ids[:10]:  # MediaKit 单次最多 10 个视频
+            asset = asset_repo.get(aid)
+            if not asset or not asset.storage_key:
+                continue
+            # 只处理视频素材
+            mime = getattr(asset, "mime_type", "")
+            if not mime.startswith("video/"):
+                continue
+            try:
+                url = storage_svc.get_download_url(asset.storage_key)
+                if url:
+                    video_urls.append(url)
+                    url_to_asset_id[url] = aid
+            except Exception as e:
+                logger.warning("获取素材URL失败: asset_id=%s error=%s", aid, str(e))
+
+        if not video_urls:
+            logger.info("无可用视频素材，跳过视频理解分析")
+            return {}
+
+        # 调用 MediaKit 视频理解
+        prompt = (
+            "请简要描述这段视频的主要内容，包括：场景（室内/室外/具体场所）、"
+            "主体（人物/物体/动物）、动作/活动、氛围/情绪、主要色调。"
+            "控制在100字以内。"
+        )
+
+        contents = client.analyze_videos(
+            video_urls=video_urls,
+            prompt=prompt,
+            level="Economy",
+        )
+
+        if not contents:
+            logger.warning("MediaKit 视频理解未返回结果")
+            return {}
+
+        # 将结果映射回 asset_id
+        analyses: dict[str, str] = {}
+        for i, content in enumerate(contents):
+            if i < len(video_urls) and content:
+                asset_id = url_to_asset_id.get(video_urls[i])
+                if asset_id:
+                    analyses[asset_id] = content
+
+        logger.info(
+            "MediaKit 视频理解完成: total=%d analyzed=%d",
+            len(video_urls),
+            len(analyses),
+        )
+        return analyses
+
+    except Exception as e:
+        logger.warning("MediaKit 视频理解异常，将降级到无分析模式: %s", str(e))
+        return {}
+
+
 @router.post("/ai-recommend", response_model=AIRecommendResponse)
 def editor_ai_recommend(
     template_id: str,
@@ -46,12 +131,16 @@ def editor_ai_recommend(
 
     from packages.shared.ai_service import run_ai_recommend
 
+    # 调用 MediaKit 视频理解，获取素材内容分析
+    asset_analyses = _build_asset_analyses(body.asset_ids, db)
+
     result = run_ai_recommend(
         plan_id=plan_id,
         template_id=plan.template_id,
         asset_ids=body.asset_ids,
         editing_mode=body.editing_mode,
         target_duration=body.target_duration,
+        asset_analyses=asset_analyses,
     )
 
     try:
diff --git a/packages/shared/ai_service.py b/packages/shared/ai_service.py
index bba27de7e..c8a066b1d 100755
--- a/packages/shared/ai_service.py
+++ b/packages/shared/ai_service.py
@@ -196,20 +196,54 @@ def _call_ai_recommend_service(
     asset_ids: List[str],
     editing_mode: str,
     target_duration: float,
+    asset_analyses: Optional[Dict[str, str]] = None,
 ) -> Dict[str, Any]:
     """调用 AI 推荐服务生成片段编排方案.
 
     优先使用豆包大模型生成，失败或未配置时降级为本地规则生成。
+    当提供 asset_analyses 时，会将每个素材的视频理解结果注入 prompt，
+    让 LLM 能基于视频实际内容做智能编排。
+
+    Args:
+        plan_id: 剪辑计划 ID
+        template_id: 模板 ID
+        asset_ids: 素材 ID 列表
+        editing_mode: 剪辑模式
+        target_duration: 目标时长（秒）
+        asset_analyses: 可选，{asset_id: 视频理解文本} 映射
     """
     client = get_doubao_client()
     if not client.is_available:
         logger.info("豆包API未配置，使用本地降级生成AI推荐方案")
         return _fallback_recommend_clips(plan_id, template_id, asset_ids, editing_mode, target_duration)
 
+    # 构建素材描述（含视频理解结果）
+    asset_analyses = asset_analyses or {}
+    asset_lines = []
+    for aid in asset_ids[:30]:
+        analysis = asset_analyses.get(aid, "")
+        if analysis:
+            # 截断过长的分析结果，避免 token 爆炸
+            analysis_truncated = analysis[:300] + ("..." if len(analysis) > 300 else "")
+            asset_lines.append(f"  - 素材ID: {aid}\n    内容描述: {analysis_truncated}")
+        else:
+            asset_lines.append(f"  - 素材ID: {aid}")
+
+    assets_desc = "\n".join(asset_lines)
+    has_analysis = any(aid in asset_analyses for aid in asset_ids[:30])
+
     # 构建 prompt
     system_prompt = (
-        "你是一个专业的视频剪辑导演助手。"
-        "根据提供的素材列表和目标时长，设计一个完整的视频片段编排方案。\n"
+        "你是一个专业的视频剪辑导演助手。" "根据提供的素材列表和目标时长，设计一个完整的视频片段编排方案。\n"
+    )
+    if has_analysis:
+        system_prompt += (
+            "每个素材附带了 AI 视频理解的内容描述，请根据素材的实际内容来决策编排：\n"
+            "- 将内容相关的素材放在一起，保持叙事连贯\n"
+            "- 根据素材内容合理安排片段顺序（如开场用吸引人的画面、高潮部分紧凑切换等）\n"
+            "- 为每个片段选择最匹配的素材，并在 text_content 中体现素材主题\n"
+        )
+    system_prompt += (
         "要求：\n"
         "1. 片段类型分为三类：intro（开场）、showcase（展示）、outro（结尾）\n"
         "2. 每个片段包含：clip_type、order、text_content（字幕/标题文字）、"
@@ -221,7 +255,6 @@ def _call_ai_recommend_service(
         '返回格式：{"clips": [...], "title": "视频标题", "confidence": 0.85}'
     )
 
-    assets_desc = "\n".join([f"  - 素材ID: {aid}" for i, aid in enumerate(asset_ids[:30])])
     user_prompt = (
         f"剪辑计划ID: {plan_id}\n"
         f"模板ID: {template_id}\n"
@@ -246,11 +279,12 @@ def _call_ai_recommend_service(
         parsed = _parse_recommend_response(result, asset_ids, target_duration)
         if parsed and len(parsed["clips"]) >= 2:
             logger.info(
-                "豆包AI推荐生成成功: plan_id=%s clips=%d duration=%.1f confidence=%.2f",
+                "豆包AI推荐生成成功: plan_id=%s clips=%d duration=%.1f confidence=%.2f has_analysis=%s",
                 plan_id,
                 len(parsed["clips"]),
                 parsed["total_duration"],
                 parsed["confidence"],
+                has_analysis,
             )
             return parsed
         logger.warning("豆包AI推荐返回解析失败，降级到本地方案: %s", result[:100])
@@ -354,6 +388,7 @@ def run_ai_recommend(
     asset_ids: List[str],
     editing_mode: str = "one_take",
     target_duration: float = 30.0,
+    asset_analyses: Optional[Dict[str, str]] = None,
 ) -> Dict[str, Any]:
     """执行 AI 推荐片段方案
 
@@ -363,17 +398,19 @@ def run_ai_recommend(
         asset_ids: 素材 ID 列表
         editing_mode: 剪辑模式 (one_take / pip / voice_over / voice_pip)
         target_duration: 目标时长（秒）
+        asset_analyses: 可选，{asset_id: 视频理解文本} 映射
 
     Returns:
         推荐方案 dict，包含 clips / config / total_duration / confidence
     """
     logger.info(
-        "AI 推荐片段方案: plan_id=%s template_id=%s assets=%d mode=%s duration=%.1f",
+        "AI 推荐片段方案: plan_id=%s template_id=%s assets=%d mode=%s duration=%.1f has_analysis=%s",
         plan_id,
         template_id,
         len(asset_ids),
         editing_mode,
         target_duration,
+        bool(asset_analyses),
     )
     result = _call_ai_recommend_service(
         plan_id=plan_id,
@@ -381,6 +418,7 @@ def run_ai_recommend(
         asset_ids=asset_ids,
         editing_mode=editing_mode,
         target_duration=target_duration,
+        asset_analyses=asset_analyses,
     )
     logger.info(
         "AI 推荐完成: plan_id=%s clips=%d duration=%.1f confidence=%.2f",
diff --git a/packages/shared/mediakit_client.py b/packages/shared/mediakit_client.py
index 4848a70f8..1bb6bf617 100755
--- a/packages/shared/mediakit_client.py
+++ b/packages/shared/mediakit_client.py
@@ -115,13 +115,153 @@ class MediaKitClient:
             logger.exception("MediaKit 抽帧任务提交异常: %s", str(e))
             return None
 
+    def analyze_videos(
+        self,
+        video_urls: List[str],
+        prompt: str,
+        level: str = "Economy",
+        poll_interval: float = 3.0,
+        max_poll_attempts: int = 60,
+    ) -> Optional[List[str]]:
+        """调用 MediaKit 视频理解智能策略 API.
+
+        基于火山方舟视觉大模型，对输入的视频 URL 列表进行内容分析，
+        返回每个视频的自然语言描述（用于智能选片段等场景）。
+
+        Args:
+            video_urls: 视频 URL 列表（最多 10 个，需公网可访问）
+            prompt: 指导大模型分析的自然语言指令
+            level: 分析档位 Economy / Balanced / Quality
+            poll_interval: 轮询间隔（秒）
+            max_poll_attempts: 最大轮询次数
+
+        Returns:
+            分析结果列表，每个元素对应 video_urls 中同索引视频的分析文本。
+            失败返回 None。
+        """
+        if not self.is_available:
+            logger.warning("MediaKit 未配置，跳过视频理解")
+            return None
+
+        if not video_urls:
+            return None
+
+        task_id = self._submit_video_understand_task(video_urls, prompt, level)
+        if not task_id:
+            return None
+
+        return self._poll_video_understand_result(task_id, poll_interval, max_poll_attempts)
+
+    def _submit_video_understand_task(
+        self,
+        video_urls: List[str],
+        prompt: str,
+        level: str,
+    ) -> Optional[str]:
+        """提交视频理解任务，返回 task_id."""
+        url = f"{self.base_url}/tools/video-understand-router"
+        headers = {
+            "Authorization": f"Bearer {self.api_key}",
+            "Content-Type": "application/json",
+        }
+
+        payload = {
+            "video_urls": video_urls,
+            "prompt": prompt,
+            "level": level,
+        }
+
+        try:
+            response = httpx.post(url, headers=headers, json=payload, timeout=self.timeout)
+            response.raise_for_status()
+            data = response.json()
+
+            task_id = data.get("task_id")
+            if not task_id:
+                logger.error("MediaKit 视频理解任务提交失败: 无 task_id. response=%s", data)
+                return None
+
+            logger.info(
+                "MediaKit 视频理解任务已提交: task_id=%s videos=%d level=%s",
+                task_id,
+                len(video_urls),
+                level,
+            )
+            return task_id
+
+        except Exception as e:
+            logger.exception("MediaKit 视频理解任务提交异常: %s", str(e))
+            return None
+
+    def _poll_video_understand_result(
+        self,
+        task_id: str,
+        poll_interval: float,
+        max_poll_attempts: int,
+    ) -> Optional[List[str]]:
+        """轮询视频理解任务结果，返回 contents 列表."""
+        url = f"{self.base_url}/tasks/{task_id}"
+        headers = {
+            "Authorization": f"Bearer {self.api_key}",
+        }
+
+        for attempt in range(max_poll_attempts):
+            try:
+                response = httpx.get(url, headers=headers, timeout=self.timeout)
+                response.raise_for_status()
+                data = response.json()
+
+                status = data.get("status")
+                if status in ("completed", "success"):
+                    result = data.get("result", {})
+                    contents = result.get("contents", [])
+                    logger.info(
+                        "MediaKit 视频理解完成: task_id=%s videos=%d",
+                        task_id,
+                        len(contents),
+                    )
+                    return contents if contents else None
+
+                elif status == "failed":
+                    error_msg = data.get("error", "unknown error")
+                    logger.error(
+                        "MediaKit 视频理解任务失败: task_id=%s error=%s",
+                        task_id,
+                        error_msg,
+                    )
+                    return None
+
+                logger.debug(
+                    "MediaKit 视频理解进行中: task_id=%s status=%s attempt=%d/%d",
+                    task_id,
+                    status,
+                    attempt + 1,
+                    max_poll_attempts,
+                )
+                time.sleep(poll_interval)
+
+            except Exception as e:
+                logger.exception(
+                    "MediaKit 视频理解轮询异常: task_id=%s error=%s",
+                    task_id,
+                    str(e),
+                )
+                time.sleep(poll_interval)
+
+        logger.error(
+            "MediaKit 视频理解超时: task_id=%s max_attempts=%d",
+            task_id,
+            max_poll_attempts,
+        )
+        return None
+
     def _poll_task_result(
         self,
         task_id: str,
         poll_interval: float,
         max_poll_attempts: int,
     ) -> Optional[List[Dict[str, Any]]]:
-        """轮询任务状态，返回结果."""
+        """轮询抽帧任务状态，返回结果."""
         url = f"{self.base_url}/tasks/{task_id}"
         headers = {
             "Authorization": f"Bearer {self.api_key}",
diff --git a/tests/unit/test_mediakit_video_understand.py b/tests/unit/test_mediakit_video_understand.py
new file mode 100755
index 000000000..9dca81460
--- /dev/null
+++ b/tests/unit/test_mediakit_video_understand.py
@@ -0,0 +1,436 @@
+"""#1209 MediaKit 视频理解 + AI 智能选片段集成测试.
+
+覆盖范围：
+1. MediaKitClient.analyze_videos — 正常流程、不可用降级、空输入
+2. _call_ai_recommend_service 带 asset_analyses — prompt 注入验证
+3. _build_asset_analyses — API 路由层集成逻辑
+4. run_ai_recommend — asset_analyses 透传
+"""
+
+from __future__ import annotations
+
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+# ── MediaKitClient.analyze_videos ─────────────────────────────────────────────
+
+
+class TestMediaKitClientAnalyzeVideos:
+    """MediaKitClient.analyze_videos 单元测试."""
+
+    def _make_client(self, api_key: str = "test-key") -> object:
+        from packages.shared.mediakit_client import MediaKitClient
+
+        with patch("packages.shared.mediakit_client.get_shared_settings") as mock_settings:
+            mock_settings.return_value = MagicMock(
+                mediakit_api_key=api_key,
+                mediakit_base_url="https://mock.mediakit.com/api/v1",
+                mediakit_timeout=30,
+            )
+            return MediaKitClient()
+
+    def test_analyze_videos_not_available(self):
+        """未配置 API Key 时返回 None."""
+        client = self._make_client(api_key="")
+        result = client.analyze_videos(
+            video_urls=["https://example.com/video.mp4"],
+            prompt="describe this video",
+        )
+        assert result is None
+
+    def test_analyze_videos_empty_urls(self):
+        """空 URL 列表返回 None."""
+        client = self._make_client()
+        result = client.analyze_videos(video_urls=[], prompt="describe")
+        assert result is None
+
+    @patch("packages.shared.mediakit_client.httpx.post")
+    @patch("packages.shared.mediakit_client.httpx.get")
+    def test_analyze_videos_success(self, mock_get, mock_post):
+        """正常提交任务并获取结果."""
+        # 提交任务返回 task_id
+        mock_post.return_value = MagicMock(
+            status_code=200,
+            json=lambda: {"success": True, "task_id": "test-task-123"},
+        )
+        mock_post.return_value.raise_for_status = MagicMock()
+
+        # 轮询返回 completed
+        mock_get.return_value = MagicMock(
+            status_code=200,
+            json=lambda: {
+                "success": True,
+                "task_id": "test-task-123",
+                "status": "completed",
+                "result": {
+                    "duration": 30.5,
+                    "contents": [
+                        "视频展示了城市日景，包含车流和行人，氛围繁忙。",
+                        "视频展示了夜晚霓虹灯特写，色调偏暖。",
+                    ],
+                },
+            },
+        )
+        mock_get.return_value.raise_for_status = MagicMock()
+
+        client = self._make_client()
+        result = client.analyze_videos(
+            video_urls=["https://example.com/v1.mp4", "https://example.com/v2.mp4"],
+            prompt="描述视频内容",
+            level="Economy",
+            poll_interval=0.01,  # 测试用快速轮询
+        )
+
+        assert result is not None
+        assert len(result) == 2
+        assert "城市日景" in result[0]
+        assert "霓虹灯" in result[1]
+
+        # 验证提交参数
+        call_args = mock_post.call_args
+        assert "/tools/video-understand-router" in call_args.args[0]
+        payload = call_args.kwargs["json"]
+        assert payload["video_urls"] == ["https://example.com/v1.mp4", "https://example.com/v2.mp4"]
+        assert payload["prompt"] == "描述视频内容"
+        assert payload["level"] == "Economy"
+
+    @patch("packages.shared.mediakit_client.httpx.post")
+    def test_analyze_videos_submit_failure(self, mock_post):
+        """提交任务失败返回 None."""
+        mock_post.side_effect = Exception("Network error")
+
+        client = self._make_client()
+        result = client.analyze_videos(
+            video_urls=["https://example.com/v1.mp4"],
+            prompt="describe",
+            poll_interval=0.01,
+        )
+        assert result is None
+
+    @patch("packages.shared.mediakit_client.httpx.post")
+    @patch("packages.shared.mediakit_client.httpx.get")
+    def test_analyze_videos_task_failed(self, mock_get, mock_post):
+        """任务状态为 failed 时返回 None."""
+        mock_post.return_value = MagicMock(
+            status_code=200,
+            json=lambda: {"task_id": "task-fail"},
+        )
+        mock_post.return_value.raise_for_status = MagicMock()
+
+        mock_get.return_value = MagicMock(
+            status_code=200,
+            json=lambda: {"status": "failed", "error": "model timeout"},
+        )
+        mock_get.return_value.raise_for_status = MagicMock()
+
+        client = self._make_client()
+        result = client.analyze_videos(
+            video_urls=["https://example.com/v.mp4"],
+            prompt="describe",
+            poll_interval=0.01,
+        )
+        assert result is None
+
+    @patch("packages.shared.mediakit_client.httpx.post")
+    @patch("packages.shared.mediakit_client.httpx.get")
+    def test_analyze_videos_timeout(self, mock_get, mock_post):
+        """超过最大轮询次数返回 None."""
+        mock_post.return_value = MagicMock(
+            status_code=200,
+            json=lambda: {"task_id": "task-slow"},
+        )
+        mock_post.return_value.raise_for_status = MagicMock()
+
+        # 一直返回 processing
+        mock_get.return_value = MagicMock(
+            status_code=200,
+            json=lambda: {"status": "processing"},
+        )
+        mock_get.return_value.raise_for_status = MagicMock()
+
+        client = self._make_client()
+        result = client.analyze_videos(
+            video_urls=["https://example.com/v.mp4"],
+            prompt="describe",
+            poll_interval=0.001,
+            max_poll_attempts=3,
+        )
+        assert result is None
+
+
+# ── _call_ai_recommend_service with asset_analyses ────────────────────────────
+
+
+class TestCallAiRecommendWithAnalysis:
+    """测试 _call_ai_recommend_service 带 asset_analyses 的行为."""
+
+    @patch("packages.shared.ai_service.get_doubao_client")
+    def test_analysis_included_in_prompt(self, mock_get_client):
+        """有分析结果时，prompt 包含视频内容描述."""
+        mock_client = MagicMock()
+        mock_client.is_available = True
+        mock_get_client.return_value = mock_client
+
+        # 模拟豆包返回一个有效 JSON
+        mock_client.chat_completion.return_value = (
+            '{"clips": [{"clip_type": "intro", "order": 0, "text_content": "开场",'
+            '"duration": 3.0, "transition_effect": "fade", "asset_id": "asset1",'
+            '"start_time": 0.0, "config": {}}, {"clip_type": "outro", "order": 1,'
+            '"text_content": "结尾", "duration": 3.0, "transition_effect": "fade",'
+            '"asset_id": "", "start_time": 0.0, "config": {}}],'
+            '"title": "测试视频", "confidence": 0.9}'
+        )
+
+        from packages.shared.ai_service import _call_ai_recommend_service
+
+        result = _call_ai_recommend_service(
+            plan_id="plan-1",
+            template_id="tmpl-1",
+            asset_ids=["asset1", "asset2"],
+            editing_mode="one_take",
+            target_duration=30.0,
+            asset_analyses={
+                "asset1": "室内场景，一位女性在桌前讲解产品，氛围轻松专业",
+                "asset2": "室外公园，阳光充足，有孩子在玩耍",
+            },
+        )
+
+        assert result is not None
+        assert len(result["clips"]) == 2
+
+        # 验证 prompt 中包含了视频分析内容
+        messages = mock_client.chat_completion.call_args.kwargs["messages"]
+        system_prompt = messages[0]["content"]
+        assert "叙事连贯" in system_prompt  # 有分析时的额外指导
+
+        user_prompt = messages[1]["content"]
+        assert "室内场景" in user_prompt
+        assert "室外公园" in user_prompt
+
+    @patch("packages.shared.ai_service.get_doubao_client")
+    def test_no_analysis_basic_prompt(self, mock_get_client):
+        """无分析结果时，prompt 保持基本格式."""
+        mock_client = MagicMock()
+        mock_client.is_available = True
+        mock_get_client.return_value = mock_client
+
+        mock_client.chat_completion.return_value = (
+            '{"clips": [{"clip_type": "showcase", "order": 0, "text_content": "展示",'
+            '"duration": 5.0, "transition_effect": "cut", "asset_id": "a1",'
+            '"start_time": 0.0, "config": {}}],'
+            '"title": "简单视频", "confidence": 0.8}'
+        )
+
+        from packages.shared.ai_service import _call_ai_recommend_service
+
+        result = _call_ai_recommend_service(
+            plan_id="plan-2",
+            template_id="tmpl-1",
+            asset_ids=["a1"],
+            editing_mode="one_take",
+            target_duration=10.0,
+            # 不传 asset_analyses
+        )
+
+        assert result is not None
+
+        # 验证 prompt 中不含叙事连贯等指导
+        messages = mock_client.chat_completion.call_args.kwargs["messages"]
+        system_prompt = messages[0]["content"]
+        assert "叙事连贯" not in system_prompt
+
+    @patch("packages.shared.ai_service.get_doubao_client")
+    def test_partial_analysis_only_some_assets(self, mock_get_client):
+        """部分素材有分析结果时，只有被分析的素材包含内容描述."""
+        mock_client = MagicMock()
+        mock_client.is_available = True
+        mock_get_client.return_value = mock_client
+
+        mock_client.chat_completion.return_value = (
+            '{"clips": [{"clip_type": "showcase", "order": 0, "text_content": "展示",'
+            '"duration": 5.0, "transition_effect": "cut", "asset_id": "a1",'
+            '"start_time": 0.0, "config": {}}],'
+            '"title": "部分分析", "confidence": 0.85}'
+        )
+
+        from packages.shared.ai_service import _call_ai_recommend_service
+
+        _call_ai_recommend_service(
+            plan_id="plan-3",
+            template_id="tmpl-1",
+            asset_ids=["a1", "a2", "a3"],
+            editing_mode="one_take",
+            target_duration=15.0,
+            asset_analyses={
+                "a1": "海边日落，金色阳光",  # 只有 a1 有分析
+            },
+        )
+
+        messages = mock_client.chat_completion.call_args.kwargs["messages"]
+        user_prompt = messages[1]["content"]
+        assert "海边日落" in user_prompt
+        # a2 和 a3 应该只有 ID，没有内容描述
+        assert "素材ID: a2" in user_prompt
+        assert "素材ID: a3" in user_prompt
+
+
+# ── run_ai_recommend with asset_analyses ──────────────────────────────────────
+
+
+class TestRunAiRecommendWithAnalysis:
+    """run_ai_recommend 透传 asset_analyses."""
+
+    @patch("packages.shared.ai_service._call_ai_recommend_service")
+    def test_passes_through_analysis(self, mock_call):
+        """asset_analyses 正确传递给底层服务."""
+        from packages.shared.ai_service import run_ai_recommend
+
+        mock_call.return_value = {
+            "clips": [
+                {
+                    "clip_type": "showcase",
+                    "order": 0,
+                    "text_content": "t",
+                    "duration": 3.0,
+                    "transition_effect": "cut",
+                    "asset_id": "a1",
+                    "start_time": 0.0,
+                    "config": {},
+                }
+            ],
+            "config": {"title": {"text": "test", "ai_auto": True}},
+            "total_duration": 3.0,
+            "confidence": 0.85,
+        }
+
+        analyses = {"a1": "海边日落场景"}
+        run_ai_recommend(
+            plan_id="plan-1",
+            template_id="tmpl-1",
+            asset_ids=["a1"],
+            editing_mode="one_take",
+            target_duration=10.0,
+            asset_analyses=analyses,
+        )
+
+        # 验证传递
+        call_kwargs = mock_call.call_args.kwargs
+        assert call_kwargs["asset_analyses"] == analyses
+
+    @patch("packages.shared.ai_service._call_ai_recommend_service")
+    def test_default_no_analysis(self, mock_call):
+        """默认不传 asset_analyses 时为 None."""
+        from packages.shared.ai_service import run_ai_recommend
+
+        mock_call.return_value = {
+            "clips": [
+                {
+                    "clip_type": "showcase",
+                    "order": 0,
+                    "text_content": "t",
+                    "duration": 3.0,
+                    "transition_effect": "cut",
+                    "asset_id": "a1",
+                    "start_time": 0.0,
+                    "config": {},
+                }
+            ],
+            "config": {"title": {"text": "test", "ai_auto": True}},
+            "total_duration": 3.0,
+            "confidence": 0.85,
+        }
+
+        run_ai_recommend(
+            plan_id="plan-1",
+            template_id="tmpl-1",
+            asset_ids=["a1"],
+        )
+
+        call_kwargs = mock_call.call_args.kwargs
+        assert call_kwargs["asset_analyses"] is None
+
+
+# ── _build_asset_analyses (API route helper) ─────────────────────────────────
+
+
+class TestBuildAssetAnalyses:
+    """_build_asset_analyses 集成逻辑测试."""
+
+    def test_empty_asset_ids(self):
+        """空素材列表返回空 dict."""
+        from apps.api.app.api.routes.templates_editor.ai_features import (
+            _build_asset_analyses,
+        )
+
+        result = _build_asset_analyses([], MagicMock())
+        assert result == {}
+
+    @patch("packages.shared.mediakit_client.get_mediakit_client")
+    def test_mediakit_not_available(self, mock_get_client):
+        """MediaKit 不可用时返回空 dict."""
+        mock_client = MagicMock()
+        mock_client.is_available = False
+        mock_get_client.return_value = mock_client
+
+        # 需要 patch 在 packages.shared.mediakit_client 层面，因为 _build_asset_analyses 内部 from import
+        from apps.api.app.api.routes.templates_editor.ai_features import (
+            _build_asset_analyses,
+        )
+
+        result = _build_asset_analyses(["asset1"], MagicMock())
+        assert result == {}
+
+    def test_exception_returns_empty(self):
+        """任何异常都返回空 dict，不阻塞主流程."""
+        from apps.api.app.api.routes.templates_editor.ai_features import (
+            _build_asset_analyses,
+        )
+
+        # 传一个 mock db，让内部自然失败
+        mock_db = MagicMock()
+        mock_db.side_effect = None  # db 本身不抛异常，但内部操作会失败
+
+        result = _build_asset_analyses(["nonexistent-asset"], mock_db)
+        assert result == {}
+
+
+# ── 长文本截断验证 ───────────────────────────────────────────────────────────
+
+
+class TestAnalysisTruncation:
+    """验证过长分析文本被截断以避免 token 爆炸."""
+
+    @patch("packages.shared.ai_service.get_doubao_client")
+    def test_long_analysis_truncated(self, mock_get_client):
+        """超过 300 字的分析文本被截断并加 ...."""
+        mock_client = MagicMock()
+        mock_client.is_available = True
+        mock_get_client.return_value = mock_client
+
+        mock_client.chat_completion.return_value = (
+            '{"clips": [{"clip_type": "showcase", "order": 0, "text_content": "t",'
+            '"duration": 3.0, "transition_effect": "cut", "asset_id": "a1",'
+            '"start_time": 0.0, "config": {}}],'
+            '"title": "test", "confidence": 0.8}'
+        )
+
+        from packages.shared.ai_service import _call_ai_recommend_service
+
+        long_analysis = "A" * 500  # 500 字符
+
+        _call_ai_recommend_service(
+            plan_id="plan-1",
+            template_id="tmpl-1",
+            asset_ids=["a1"],
+            editing_mode="one_take",
+            target_duration=10.0,
+            asset_analyses={"a1": long_analysis},
+        )
+
+        messages = mock_client.chat_completion.call_args.kwargs["messages"]
+        user_prompt = messages[1]["content"]
+        # 截断后应该包含 ...
+        assert "..." in user_prompt
+        # 原始 500 字符不应完整出现
+        assert "A" * 500 not in user_prompt