diff --git a/backend/app/api/outlines.py b/backend/app/api/outlines.py
index 1dc4e57..99b698f 100644
--- a/backend/app/api/outlines.py
+++ b/backend/app/api/outlines.py
@@ -2451,6 +2451,284 @@ async def expand_outline_generator(
         yield await tracker.error(f"展开失败: {str(e)}")
 
 
+async def _save_background_task_result(db: AsyncSession, task_id: str, result_data: Dict[str, Any]) -> None:
+    """保存后台任务结果到 background_tasks.task_result。"""
+    from app.models.background_task import BackgroundTask
+
+    task_result = await db.execute(select(BackgroundTask).where(BackgroundTask.id == task_id))
+    task = task_result.scalar_one_or_none()
+    if task:
+        task.task_result = result_data
+        await db.commit()
+
+
+async def _run_outline_expansion_background(
+    task_id: str,
+    user_id: str,
+    outline_id: str,
+    data: Dict[str, Any]
+):
+    """后台执行单个大纲展开并可直接创建章节。"""
+    from app.database import get_engine
+    from app.api.settings import get_user_ai_service_from_db
+    from app.services.background_task_service import TaskProgressTracker
+    from sqlalchemy.ext.asyncio import async_sessionmaker, AsyncSession as BgAsyncSession
+
+    engine = await get_engine(user_id)
+    AsyncSessionLocal = async_sessionmaker(engine, class_=BgAsyncSession, expire_on_commit=False)
+
+    async with AsyncSessionLocal() as bg_db:
+        tracker = TaskProgressTracker(task_id, user_id, "大纲展开")
+        try:
+            await tracker.start("开始大纲展开任务...")
+
+            target_chapter_count = int(data.get("target_chapter_count", 3))
+            expansion_strategy = data.get("expansion_strategy", "balanced")
+            enable_scene_analysis = data.get("enable_scene_analysis", True)
+            auto_create_chapters = data.get("auto_create_chapters", True)
+            batch_size = int(data.get("batch_size", 5))
+
+            await tracker.loading("加载大纲信息...", 0.3)
+            outline_result = await bg_db.execute(select(Outline).where(Outline.id == outline_id))
+            outline = outline_result.scalar_one_or_none()
+            if not outline:
+                raise ValueError("大纲不存在")
+
+            await tracker.loading("加载项目信息...", 0.7)
+            project_result = await bg_db.execute(select(Project).where(Project.id == outline.project_id))
+            project = project_result.scalar_one_or_none()
+            if not project:
+                raise ValueError("项目不存在")
+
+            if await tracker.check_cancelled():
+                return
+
+            await tracker.preparing(f"准备展开《{outline.title}》为 {target_chapter_count} 章...")
+
+            bg_ai_service = await get_user_ai_service_from_db(user_id, bg_db)
+            expansion_service = PlotExpansionService(bg_ai_service)
+
+            await tracker.generating(
+                current_chars=0,
+                estimated_total=target_chapter_count * 500,
+                message=f"AI分析大纲《{outline.title}》，生成章节规划..."
+            )
+
+            chapter_plans = await expansion_service.analyze_outline_for_chapters(
+                outline=outline,
+                project=project,
+                db=bg_db,
+                target_chapter_count=target_chapter_count,
+                expansion_strategy=expansion_strategy,
+                enable_scene_analysis=enable_scene_analysis,
+                provider=data.get("provider"),
+                model=data.get("model"),
+                batch_size=batch_size,
+                progress_callback=None
+            )
+
+            if await tracker.check_cancelled():
+                return
+            if not chapter_plans:
+                raise ValueError("AI分析失败，未能生成章节规划")
+
+            await tracker.parsing(f"规划生成完成，共 {len(chapter_plans)} 个章节")
+
+            created_chapters = None
+            if auto_create_chapters:
+                await tracker.saving("创建章节记录...", 0.3)
+                created_chapters = await expansion_service.create_chapters_from_plans(
+                    outline_id=outline_id,
+                    chapter_plans=chapter_plans,
+                    project_id=outline.project_id,
+                    db=bg_db,
+                    start_chapter_number=None
+                )
+                await tracker.saving(f"成功创建 {len(created_chapters)} 个章节记录", 0.8)
+
+            result_data = {
+                "outline_id": outline_id,
+                "outline_title": outline.title,
+                "target_chapter_count": target_chapter_count,
+                "actual_chapter_count": len(chapter_plans),
+                "expansion_strategy": expansion_strategy,
+                "chapter_plans": chapter_plans,
+                "created_chapters": [
+                    {
+                        "id": ch.id,
+                        "chapter_number": ch.chapter_number,
+                        "title": ch.title,
+                        "summary": ch.summary,
+                        "outline_id": ch.outline_id,
+                        "sub_index": ch.sub_index,
+                        "status": ch.status
+                    }
+                    for ch in created_chapters
+                ] if created_chapters else None
+            }
+            await _save_background_task_result(bg_db, task_id, result_data)
+            await tracker.complete(f"《{outline.title}》展开完成")
+        except Exception as e:
+            logger.error(f"后台大纲展开失败: {str(e)}", exc_info=True)
+            try:
+                if bg_db.in_transaction():
+                    await bg_db.rollback()
+            except Exception:
+                pass
+            await tracker.error(str(e))
+
+
+async def _run_batch_outline_expansion_background(
+    task_id: str,
+    user_id: str,
+    data: Dict[str, Any]
+):
+    """后台执行批量大纲展开并可直接创建章节。"""
+    from app.database import get_engine
+    from app.api.settings import get_user_ai_service_from_db
+    from app.services.background_task_service import TaskProgressTracker
+    from sqlalchemy.ext.asyncio import async_sessionmaker, AsyncSession as BgAsyncSession
+
+    engine = await get_engine(user_id)
+    AsyncSessionLocal = async_sessionmaker(engine, class_=BgAsyncSession, expire_on_commit=False)
+
+    async with AsyncSessionLocal() as bg_db:
+        tracker = TaskProgressTracker(task_id, user_id, "批量大纲展开")
+        try:
+            await tracker.start("开始批量大纲展开任务...")
+
+            project_id = data.get("project_id")
+            chapters_per_outline = int(data.get("chapters_per_outline", 3))
+            expansion_strategy = data.get("expansion_strategy", "balanced")
+            auto_create_chapters = data.get("auto_create_chapters", True)
+            outline_ids = data.get("outline_ids")
+
+            await tracker.loading("加载项目信息...", 0.4)
+            project_result = await bg_db.execute(select(Project).where(Project.id == project_id))
+            project = project_result.scalar_one_or_none()
+            if not project:
+                raise ValueError("项目不存在")
+
+            await tracker.loading("获取大纲列表...", 0.8)
+            if outline_ids:
+                outlines_result = await bg_db.execute(
+                    select(Outline)
+                    .where(Outline.project_id == project_id, Outline.id.in_(outline_ids))
+                    .order_by(Outline.order_index)
+                )
+            else:
+                outlines_result = await bg_db.execute(
+                    select(Outline)
+                    .where(Outline.project_id == project_id)
+                    .order_by(Outline.order_index)
+                )
+            outlines = outlines_result.scalars().all()
+            if not outlines:
+                raise ValueError("没有找到要展开的大纲")
+
+            total_outlines = len(outlines)
+            await tracker.preparing(f"共找到 {total_outlines} 个大纲，准备批量展开...")
+
+            bg_ai_service = await get_user_ai_service_from_db(user_id, bg_db)
+            expansion_service = PlotExpansionService(bg_ai_service)
+
+            expansion_results = []
+            skipped_outlines = []
+            total_chapters_created = 0
+
+            for idx, outline in enumerate(outlines):
+                if await tracker.check_cancelled():
+                    return
+
+                await tracker.generating(
+                    current_chars=idx * chapters_per_outline * 500,
+                    estimated_total=total_outlines * chapters_per_outline * 500,
+                    message=f"处理第 {idx + 1}/{total_outlines} 个大纲：《{outline.title}》"
+                )
+
+                existing_chapters_result = await bg_db.execute(
+                    select(Chapter).where(Chapter.outline_id == outline.id).limit(1)
+                )
+                existing_chapter = existing_chapters_result.scalar_one_or_none()
+                if existing_chapter:
+                    skipped_outlines.append({
+                        "outline_id": outline.id,
+                        "outline_title": outline.title,
+                        "reason": "已展开"
+                    })
+                    await tracker.warning(f"《{outline.title}》已展开过，已跳过")
+                    continue
+
+                chapter_plans = await expansion_service.analyze_outline_for_chapters(
+                    outline=outline,
+                    project=project,
+                    db=bg_db,
+                    target_chapter_count=chapters_per_outline,
+                    expansion_strategy=expansion_strategy,
+                    enable_scene_analysis=data.get("enable_scene_analysis", True),
+                    provider=data.get("provider"),
+                    model=data.get("model")
+                )
+
+                created_chapters = None
+                if auto_create_chapters:
+                    created_chapters = await expansion_service.create_chapters_from_plans(
+                        outline_id=outline.id,
+                        chapter_plans=chapter_plans,
+                        project_id=outline.project_id,
+                        db=bg_db,
+                        start_chapter_number=None
+                    )
+                    total_chapters_created += len(created_chapters)
+
+                expansion_results.append({
+                    "outline_id": outline.id,
+                    "outline_title": outline.title,
+                    "target_chapter_count": chapters_per_outline,
+                    "actual_chapter_count": len(chapter_plans),
+                    "expansion_strategy": expansion_strategy,
+                    "chapter_plans": chapter_plans,
+                    "created_chapters": [
+                        {
+                            "id": ch.id,
+                            "chapter_number": ch.chapter_number,
+                            "title": ch.title,
+                            "summary": ch.summary,
+                            "outline_id": ch.outline_id,
+                            "sub_index": ch.sub_index,
+                            "status": ch.status
+                        }
+                        for ch in created_chapters
+                    ] if created_chapters else None
+                })
+
+                await tracker.generating(
+                    current_chars=(idx + 1) * chapters_per_outline * 500,
+                    estimated_total=total_outlines * chapters_per_outline * 500,
+                    message=f"《{outline.title}》展开完成 ({len(chapter_plans)} 章)"
+                )
+
+            await tracker.parsing("整理批量展开结果...")
+            result_data = {
+                "project_id": project_id,
+                "total_outlines_expanded": len(expansion_results),
+                "total_chapters_created": total_chapters_created,
+                "skipped_count": len(skipped_outlines),
+                "skipped_outlines": skipped_outlines,
+                "expansion_results": expansion_results
+            }
+            await _save_background_task_result(bg_db, task_id, result_data)
+            await tracker.complete(f"批量展开完成，共创建 {total_chapters_created} 个章节")
+        except Exception as e:
+            logger.error(f"后台批量大纲展开失败: {str(e)}", exc_info=True)
+            try:
+                if bg_db.in_transaction():
+                    await bg_db.rollback()
+            except Exception:
+                pass
+            await tracker.error(str(e))
+
+
 @router.post("/{outline_id}/create-single-chapter", summary="一对一创建章节(传统模式)")
 async def create_single_chapter_from_outline(
     outline_id: str,
@@ -2549,6 +2827,48 @@ async def create_single_chapter_from_outline(
         raise HTTPException(status_code=500, detail=f"创建章节失败: {str(e)}")
 
 
+@router.post("/{outline_id}/expand-background", summary="后台展开单个大纲为多章")
+async def expand_outline_to_chapters_background(
+    outline_id: str,
+    data: Dict[str, Any],
+    request: Request,
+    db: AsyncSession = Depends(get_db)
+):
+    """创建后台任务展开单个大纲，任务完成后可在右下角后台任务面板查看结果。"""
+    result = await db.execute(select(Outline).where(Outline.id == outline_id))
+    outline = result.scalar_one_or_none()
+    if not outline:
+        raise HTTPException(status_code=404, detail="大纲不存在")
+
+    user_id = getattr(request.state, 'user_id', None)
+    await verify_project_access(outline.project_id, user_id, db)
+
+    from app.services.background_task_service import background_task_service
+
+    task_input = dict(data or {})
+    task_input["outline_id"] = outline_id
+    task_input.setdefault("auto_create_chapters", True)
+
+    task = await background_task_service.create_task(
+        user_id=user_id,
+        project_id=outline.project_id,
+        task_type="outline_expand",
+        task_input=task_input,
+        db=db
+    )
+
+    await background_task_service.spawn_background_task(
+        task.id, user_id, _run_outline_expansion_background, outline_id, task_input
+    )
+
+    return {
+        "task_id": task.id,
+        "task_type": "outline_expand",
+        "status": "pending",
+        "message": "大纲展开任务已创建，请通过后台任务面板查看进度"
+    }
+
+
 @router.post("/{outline_id}/expand-stream", summary="展开单个大纲为多章(SSE流式)")
 async def expand_outline_to_chapters_stream(
     outline_id: str,
@@ -2901,6 +3221,41 @@ async def batch_expand_outlines_generator(
         yield await SSEResponse.send_error(f"批量展开失败: {str(e)}")
 
 
+@router.post("/batch-expand-background", summary="后台批量展开大纲为多章")
+async def batch_expand_outlines_background(
+    data: Dict[str, Any],
+    request: Request,
+    db: AsyncSession = Depends(get_db)
+):
+    """创建后台任务批量展开大纲，任务完成后可在右下角后台任务面板查看结果。"""
+    user_id = getattr(request.state, 'user_id', None)
+    project = await verify_project_access(data.get("project_id"), user_id, db)
+
+    from app.services.background_task_service import background_task_service
+
+    task_input = dict(data or {})
+    task_input.setdefault("auto_create_chapters", True)
+
+    task = await background_task_service.create_task(
+        user_id=user_id,
+        project_id=project.id,
+        task_type="outline_batch_expand",
+        task_input=task_input,
+        db=db
+    )
+
+    await background_task_service.spawn_background_task(
+        task.id, user_id, _run_batch_outline_expansion_background, task_input
+    )
+
+    return {
+        "task_id": task.id,
+        "task_type": "outline_batch_expand",
+        "status": "pending",
+        "message": "批量大纲展开任务已创建，请通过后台任务面板查看进度"
+    }
+
+
 @router.post("/batch-expand-stream", summary="批量展开大纲为多章(SSE流式)")
 async def batch_expand_outlines_stream(
     data: Dict[str, Any],
diff --git a/frontend/src/components/FloatingTaskPanel.tsx b/frontend/src/components/FloatingTaskPanel.tsx
index ad8bcbf..3019ff4 100644
--- a/frontend/src/components/FloatingTaskPanel.tsx
+++ b/frontend/src/components/FloatingTaskPanel.tsx
@@ -151,6 +151,8 @@ export const FloatingTaskPanel: React.FC<FloatingTaskPanelProps> = ({
         return '大纲续写';
       case 'outline_expand':
         return '大纲展开';
+      case 'outline_batch_expand':
+        return '批量大纲展开';
       case 'chapter_generate':
         return '章节生成';
       case 'chapter_batch':
diff --git a/frontend/src/pages/Outline.tsx b/frontend/src/pages/Outline.tsx
index d7286e3..eb815a6 100644
--- a/frontend/src/pages/Outline.tsx
+++ b/frontend/src/pages/Outline.tsx
@@ -5,11 +5,9 @@ import { useStore } from '../store';
 import { eventBus } from '../store/eventBus';
 import { getProjectTasks, type TaskStatus } from '../services/backgroundTaskService';
 import { useOutlineSync } from '../store/hooks';
-import { SSEPostClient } from '../utils/sseClient';
-import { SSEProgressModal } from '../components/SSEProgressModal';
 import { generateOutlineBackground } from '../services/backgroundTaskService';
 import { outlineApi, chapterApi, projectApi, characterApi } from '../services/api';
-import type { OutlineExpansionResponse, BatchOutlineExpansionResponse, ChapterPlanItem, ApiError, Character } from '../types';
+import type { ApiError, Character } from '../types';
 
 // 大纲生成请求数据类型
 interface OutlineGenerateRequestData {
@@ -27,20 +25,6 @@ interface OutlineGenerateRequestData {
   provider?: string;
 }
 
-// 跳过的大纲信息类型
-interface SkippedOutlineInfo {
-  outline_id: string;
-  outline_title: string;
-  reason: string;
-}
-
-// 场景类型
-interface SceneInfo {
-  location: string;
-  characters: string[];
-  purpose: string;
-}
-
 // 角色/组织条目类型（新格式）
 interface CharacterEntry {
   name: string;
@@ -143,22 +127,6 @@ export default function Outline() {
   // ✅ 新增：记录场景区域的展开/折叠状态
   const [scenesExpandStatus, setScenesExpandStatus] = useState<Record<string, boolean>>({});
 
-  // 缓存批量展开的规划数据，避免重复AI调用
-  const [cachedBatchExpansionResponse, setCachedBatchExpansionResponse] = useState<BatchOutlineExpansionResponse | null>(null);
-
-  // 批量展开预览的状态
-  const [batchPreviewVisible, setBatchPreviewVisible] = useState(false);
-  const [batchPreviewData, setBatchPreviewData] = useState<BatchOutlineExpansionResponse | null>(null);
-  const [selectedOutlineIdx, setSelectedOutlineIdx] = useState(0);
-  const [selectedChapterIdx, setSelectedChapterIdx] = useState(0);
-
-  // SSE进度状态
-  const [sseProgress, setSSEProgress] = useState(0);
-  const [sseMessage, setSSEMessage] = useState('');
-  const [sseModalVisible, setSSEModalVisible] = useState(false);
-
-
-
   useEffect(() => {
     const handleResize = () => {
       setIsMobile(window.innerWidth <= 768);
@@ -923,7 +891,7 @@ export default function Outline() {
     });
   };
 
-  // 展开单个大纲为多章 - 使用SSE显示进度
+  // 展开单个大纲为多章 - 提交后台任务并在悬浮任务面板显示进度
   const handleExpandOutline = async (outlineId: string, outlineTitle: string) => {
     try {
       setIsExpanding(true);
@@ -1044,60 +1012,39 @@ export default function Outline() {
             </Form>
           </div>
         ),
-        okText: '生成规划预览',
+        okText: '提交后台任务',
         cancelText: '取消',
         onOk: async () => {
           try {
             const values = await expansionForm.validateFields();
 
-            // 关闭配置表单
             Modal.destroyAll();
-
-            // 显示SSE进度Modal
-            setSSEProgress(0);
-            setSSEMessage('正在准备展开大纲...');
-            setSSEModalVisible(true);
             setIsExpanding(true);
 
-            // 准备请求数据
             const requestData = {
               ...values,
-              auto_create_chapters: false, // 第一步：仅生成规划
+              auto_create_chapters: true,
               enable_scene_analysis: true
             };
 
-            // 使用SSE客户端调用新的流式端点
-            const apiUrl = `/api/outlines/${outlineId}/expand-stream`;
-            const client = new SSEPostClient(apiUrl, requestData, {
-              onProgress: (msg: string, progress: number) => {
-                setSSEMessage(msg);
-                setSSEProgress(progress);
-              },
-              onResult: (data: OutlineExpansionResponse) => {
-                console.log('展开完成，结果:', data);
-                // 关闭SSE进度Modal
-                setSSEModalVisible(false);
-                // 显示规划预览
-                showExpansionPreview(outlineId, data);
-              },
-              onError: (error: string) => {
-                message.error(`展开失败: ${error}`);
-                setSSEModalVisible(false);
-                setIsExpanding(false);
-              },
-              onComplete: () => {
-                setSSEModalVisible(false);
-                setIsExpanding(false);
-              }
+            const response = await fetch(`/api/outlines/${outlineId}/expand-background`, {
+              method: 'POST',
+              headers: { 'Content-Type': 'application/json' },
+              body: JSON.stringify(requestData),
             });
 
-            // 开始连接
-            client.connect();
+            if (!response.ok) {
+              const err = await response.json().catch(() => ({ detail: response.statusText }));
+              throw new Error(err.detail || '创建大纲展开任务失败');
+            }
+
+            message.success('大纲展开任务已提交，可在右下角任务面板查看进度');
+            eventBus.emit('background-task-created');
+            setIsExpanding(false);
 
           } catch (error) {
             console.error('展开失败:', error);
-            message.error('展开失败');
-            setSSEModalVisible(false);
+            message.error(error instanceof Error ? error.message : '展开失败');
             setIsExpanding(false);
           }
         },
@@ -1392,134 +1339,7 @@ export default function Outline() {
     });
   };
 
-  // 显示展开规划预览，并提供确认创建章节的选项
-  const showExpansionPreview = (outlineId: string, response: OutlineExpansionResponse) => {
-    // 缓存AI生成的规划数据
-    const cachedPlans = response.chapter_plans;
-
-    modalApi.confirm({
-      title: (
-        <Space>
-          <CheckCircleOutlined style={{ color: token.colorSuccess }} />
-          <span>展开规划预览</span>
-        </Space>
-      ),
-      width: 900,
-      centered: true,
-      okText: '确认并创建章节',
-      cancelText: '暂不创建',
-      content: (
-        <div>
-          <div style={{ marginBottom: 16 }}>
-            <Tag color="blue">策略: {response.expansion_strategy}</Tag>
-            <Tag color="green">章节数: {response.actual_chapter_count}</Tag>
-            <Tag color="orange">预览模式（未创建章节）</Tag>
-          </div>
-          <Tabs
-            defaultActiveKey="0"
-            type="card"
-            items={response.chapter_plans.map((plan, idx) => ({
-              key: idx.toString(),
-              label: (
-                <Space size="small">
-                  <span style={{ fontWeight: 500 }}>{idx + 1}. {plan.title}</span>
-                </Space>
-              ),
-              children: (
-                <div style={{ maxHeight: '500px', overflowY: 'auto', padding: '8px 0' }}>
-                  <Space direction="vertical" size="middle" style={{ width: '100%' }}>
-                    <Card size="small" title="基本信息">
-                      <Space wrap>
-                        <Tag color="blue">{plan.emotional_tone}</Tag>
-                        <Tag color="orange">{plan.conflict_type}</Tag>
-                        <Tag color="green">约{plan.estimated_words}字</Tag>
-                      </Space>
-                    </Card>
-
-                    <Card size="small" title="情节概要">
-                      {plan.plot_summary}
-                    </Card>
-
-                    <Card size="small" title="叙事目标">
-                      {plan.narrative_goal}
-                    </Card>
-
-                    <Card size="small" title="关键事件">
-                      <Space direction="vertical" size="small" style={{ width: '100%' }}>
-                        {plan.key_events.map((event, eventIdx) => (
-                          <div key={eventIdx}>• {event}</div>
-                        ))}
-                      </Space>
-                    </Card>
-
-                    <Card size="small" title="涉及角色">
-                      <Space wrap>
-                        {plan.character_focus.map((char, charIdx) => (
-                          <Tag key={charIdx} color="purple">{char}</Tag>
-                        ))}
-                      </Space>
-                    </Card>
-
-                    {plan.scenes && plan.scenes.length > 0 && (
-                      <Card size="small" title="场景">
-                        <Space direction="vertical" size="small" style={{ width: '100%' }}>
-                          {plan.scenes.map((scene, sceneIdx) => (
-                            <Card key={sceneIdx} size="small" style={{ backgroundColor: token.colorFillQuaternary }}>
-                              <div><strong>地点：</strong>{scene.location}</div>
-                              <div><strong>角色：</strong>{scene.characters.join('、')}</div>
-                              <div><strong>目的：</strong>{scene.purpose}</div>
-                            </Card>
-                          ))}
-                        </Space>
-                      </Card>
-                    )}
-                  </Space>
-                </div>
-              )
-            }))}
-          />
-        </div>
-      ),
-      onOk: async () => {
-        // 第二步：用户确认后，直接使用缓存的规划创建章节（避免重复调用AI）
-        await handleConfirmCreateChapters(outlineId, cachedPlans);
-      },
-      onCancel: () => {
-        message.info('已取消创建章节');
-      }
-    });
-  };
-
-  // 确认创建章节 - 使用缓存的规划数据，避免重复AI调用
-  const handleConfirmCreateChapters = async (
-    outlineId: string,
-    cachedPlans: ChapterPlanItem[]
-  ) => {
-    try {
-      setIsExpanding(true);
-
-      // 使用新的API端点，直接传递缓存的规划数据
-      const response = await outlineApi.createChaptersFromPlans(outlineId, cachedPlans);
-
-      message.success(
-        `成功创建${response.chapters_created}个章节！`,
-        3
-      );
-
-      console.log('✅ 使用缓存的规划创建章节，避免了重复的AI调用');
-
-      // 刷新大纲和章节列表
-      refreshOutlines();
-
-    } catch (error) {
-      console.error('创建章节失败:', error);
-      message.error('创建章节失败');
-    } finally {
-      setIsExpanding(false);
-    }
-  };
-
-  // 批量展开所有大纲 - 使用SSE流式显示进度
+  // 批量展开所有大纲 - 提交后台任务并在悬浮任务面板显示进度
   const handleBatchExpandOutlines = () => {
     if (!currentProject?.id || outlines.length === 0) {
       message.warning('没有可展开的大纲');
@@ -1585,360 +1405,50 @@ export default function Outline() {
           </Form>
         </div>
       ),
-      okText: '开始展开',
+      okText: '提交后台任务',
       cancelText: '取消',
       okButtonProps: { type: 'primary' },
       onOk: async () => {
         try {
           const values = await batchExpansionForm.validateFields();
 
-          // 关闭配置表单
           Modal.destroyAll();
-
-          // 显示SSE进度Modal
-          setSSEProgress(0);
-          setSSEMessage('正在准备批量展开...');
-          setSSEModalVisible(true);
           setIsExpanding(true);
 
-          // 准备请求数据
           const requestData = {
             project_id: currentProject.id,
             ...values,
-            auto_create_chapters: false // 第一步：仅生成规划
+            auto_create_chapters: true,
+            enable_scene_analysis: true
           };
 
-          // 使用SSE客户端
-          const apiUrl = `/api/outlines/batch-expand-stream`;
-          const client = new SSEPostClient(apiUrl, requestData, {
-            onProgress: (msg: string, progress: number) => {
-              setSSEMessage(msg);
-              setSSEProgress(progress);
-            },
-            onResult: (data: BatchOutlineExpansionResponse) => {
-              console.log('批量展开完成，结果:', data);
-              // 缓存AI生成的规划数据
-              setCachedBatchExpansionResponse(data);
-              setBatchPreviewData(data);
-              // 关闭SSE进度Modal
-              setSSEModalVisible(false);
-              // 重置选择状态
-              setSelectedOutlineIdx(0);
-              setSelectedChapterIdx(0);
-              // 显示批量预览Modal
-              setBatchPreviewVisible(true);
-            },
-            onError: (error: string) => {
-              message.error(`批量展开失败: ${error}`);
-              setSSEModalVisible(false);
-              setIsExpanding(false);
-            },
-            onComplete: () => {
-              setSSEModalVisible(false);
-              setIsExpanding(false);
-            }
+          const response = await fetch('/api/outlines/batch-expand-background', {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify(requestData),
           });
 
-          // 开始连接
-          client.connect();
+          if (!response.ok) {
+            const err = await response.json().catch(() => ({ detail: response.statusText }));
+            throw new Error(err.detail || '创建批量展开任务失败');
+          }
+
+          message.success('批量展开任务已提交，可在右下角任务面板查看进度');
+          eventBus.emit('background-task-created');
+          setIsExpanding(false);
 
         } catch (error) {
           console.error('批量展开失败:', error);
-          message.error('批量展开失败');
-          setSSEModalVisible(false);
+          message.error(error instanceof Error ? error.message : '批量展开失败');
           setIsExpanding(false);
         }
       },
     });
   };
 
-  // 渲染批量展开预览 Modal 内容
-  const renderBatchPreviewContent = () => {
-    if (!batchPreviewData) return null;
-
-    return (
-      <div>
-        {/* 顶部统计信息 */}
-        <div style={{ marginBottom: 16 }}>
-          <Tag color="blue">已处理: {batchPreviewData.total_outlines_expanded} 个大纲</Tag>
-          <Tag color="green">总章节数: {batchPreviewData.expansion_results.reduce((sum: number, r: OutlineExpansionResponse) => sum + r.actual_chapter_count, 0)}</Tag>
-          <Tag color="orange">预览模式（未创建章节）</Tag>
-          {batchPreviewData.skipped_outlines && batchPreviewData.skipped_outlines.length > 0 && (
-            <Tag color="warning">跳过: {batchPreviewData.skipped_outlines.length} 个大纲</Tag>
-          )}
-        </div>
-
-        {/* 显示跳过的大纲信息 */}
-        {batchPreviewData.skipped_outlines && batchPreviewData.skipped_outlines.length > 0 && (
-          <div style={{
-            marginBottom: 16,
-            padding: 12,
-            background: token.colorWarningBg,
-            borderRadius: token.borderRadius,
-            border: `1px solid ${token.colorWarningBorder}`
-          }}>
-            <div style={{ fontWeight: 500, marginBottom: 8, color: token.colorWarning }}>
-              ⚠️ 以下大纲已展开过，已自动跳过：
-            </div>
-            <Space direction="vertical" size="small" style={{ width: '100%' }}>
-              {batchPreviewData.skipped_outlines.map((skipped: SkippedOutlineInfo, idx: number) => (
-                <div key={idx} style={{ fontSize: 13, color: token.colorTextSecondary }}>
-                  • {skipped.outline_title} <Tag color="default" style={{ fontSize: 11 }}>{skipped.reason}</Tag>
-                </div>
-              ))}
-            </Space>
-          </div>
-        )}
-
-        {/* 水平三栏布局 */}
-        <div style={{ display: 'flex', gap: 16, height: 500 }}>
-          {/* 左栏：大纲列表 */}
-          <div style={{
-            width: 280,
-            borderRight: `1px solid ${token.colorBorderSecondary}`,
-            paddingRight: 12,
-            overflowY: 'auto'
-          }}>
-            <div style={{ fontWeight: 500, marginBottom: 8, color: token.colorTextSecondary }}>大纲列表</div>
-            <List
-              size="small"
-              dataSource={batchPreviewData.expansion_results}
-              renderItem={(result: OutlineExpansionResponse, idx: number) => (
-                <List.Item
-                  key={idx}
-                  onClick={() => {
-                    setSelectedOutlineIdx(idx);
-                    setSelectedChapterIdx(0);
-                  }}
-                  style={{
-                    cursor: 'pointer',
-                    padding: '8px 12px',
-                    background: selectedOutlineIdx === idx ? token.colorPrimaryBg : 'transparent',
-                    borderRadius: token.borderRadius,
-                    marginBottom: 4,
-                    border: selectedOutlineIdx === idx ? `1px solid ${token.colorPrimary}` : '1px solid transparent'
-                  }}
-                >
-                  <div style={{ width: '100%' }}>
-                    <div style={{ fontWeight: 500, fontSize: 13, marginBottom: 4 }}>
-                      {idx + 1}. {result.outline_title}
-                    </div>
-                    <Space size={4}>
-                      <Tag color="blue" style={{ fontSize: 11, margin: 0 }}>{result.expansion_strategy}</Tag>
-                      <Tag color="green" style={{ fontSize: 11, margin: 0 }}>{result.actual_chapter_count} 章</Tag>
-                    </Space>
-                  </div>
-                </List.Item>
-              )}
-            />
-          </div>
-
-          {/* 中栏：章节列表 */}
-          <div style={{
-            width: 320,
-            borderRight: `1px solid ${token.colorBorderSecondary}`,
-            paddingRight: 12,
-            overflowY: 'auto'
-          }}>
-            <div style={{ fontWeight: 500, marginBottom: 8, color: token.colorTextSecondary }}>
-              章节列表 ({batchPreviewData.expansion_results[selectedOutlineIdx]?.actual_chapter_count || 0} 章)
-            </div>
-            {batchPreviewData.expansion_results[selectedOutlineIdx] && (
-              <List
-                size="small"
-                dataSource={batchPreviewData.expansion_results[selectedOutlineIdx].chapter_plans}
-                renderItem={(plan: ChapterPlanItem, idx: number) => (
-                  <List.Item
-                    key={idx}
-                    onClick={() => setSelectedChapterIdx(idx)}
-                    style={{
-                      cursor: 'pointer',
-                      padding: '8px 12px',
-                      background: selectedChapterIdx === idx ? token.colorPrimaryBg : 'transparent',
-                      borderRadius: token.borderRadius,
-                      marginBottom: 4,
-                      border: selectedChapterIdx === idx ? `1px solid ${token.colorPrimary}` : '1px solid transparent'
-                    }}
-                  >
-                    <div style={{ width: '100%' }}>
-                      <div style={{ fontWeight: 500, fontSize: 13, marginBottom: 4 }}>
-                        {idx + 1}. {plan.title}
-                      </div>
-                      <Space size={4} wrap>
-                        <Tag color="blue" style={{ fontSize: 11, margin: 0 }}>{plan.emotional_tone}</Tag>
-                        <Tag color="orange" style={{ fontSize: 11, margin: 0 }}>{plan.conflict_type}</Tag>
-                        <Tag color="green" style={{ fontSize: 11, margin: 0 }}>约{plan.estimated_words}字</Tag>
-                      </Space>
-                    </div>
-                  </List.Item>
-                )}
-              />
-            )}
-          </div>
-
-          {/* 右栏：章节详情 */}
-          <div style={{ flex: 1, overflowY: 'auto', paddingLeft: 12 }}>
-            <div style={{ fontWeight: 500, marginBottom: 12, color: token.colorTextSecondary }}>章节详情</div>
-            {batchPreviewData.expansion_results[selectedOutlineIdx]?.chapter_plans[selectedChapterIdx] ? (
-              <Space direction="vertical" size="middle" style={{ width: '100%' }}>
-                <Card size="small" title="情节概要" bordered={false}>
-                  {batchPreviewData.expansion_results[selectedOutlineIdx].chapter_plans[selectedChapterIdx].plot_summary}
-                </Card>
-
-                <Card size="small" title="叙事目标" bordered={false}>
-                  {batchPreviewData.expansion_results[selectedOutlineIdx].chapter_plans[selectedChapterIdx].narrative_goal}
-                </Card>
-
-                <Card size="small" title="关键事件" bordered={false}>
-                  <Space direction="vertical" size="small" style={{ width: '100%' }}>
-                    {(batchPreviewData.expansion_results[selectedOutlineIdx].chapter_plans[selectedChapterIdx].key_events as string[]).map((event: string, eventIdx: number) => (
-                      <div key={eventIdx}>• {event}</div>
-                    ))}
-                  </Space>
-                </Card>
-
-                <Card size="small" title="涉及角色" bordered={false}>
-                  <Space wrap>
-                    {(batchPreviewData.expansion_results[selectedOutlineIdx].chapter_plans[selectedChapterIdx].character_focus as string[]).map((char: string, charIdx: number) => (
-                      <Tag key={charIdx} color="purple">{char}</Tag>
-                    ))}
-                  </Space>
-                </Card>
-
-                {batchPreviewData.expansion_results[selectedOutlineIdx].chapter_plans[selectedChapterIdx].scenes && batchPreviewData.expansion_results[selectedOutlineIdx].chapter_plans[selectedChapterIdx].scenes!.length > 0 && (
-                  <Card size="small" title="场景" bordered={false}>
-                    <Space direction="vertical" size="small" style={{ width: '100%' }}>
-                      {batchPreviewData.expansion_results[selectedOutlineIdx].chapter_plans[selectedChapterIdx].scenes!.map((scene: SceneInfo, sceneIdx: number) => (
-                        <Card key={sceneIdx} size="small" style={{ backgroundColor: token.colorFillQuaternary }}>
-                          <div><strong>地点：</strong>{scene.location}</div>
-                          <div><strong>角色：</strong>{scene.characters.join('、')}</div>
-                          <div><strong>目的：</strong>{scene.purpose}</div>
-                        </Card>
-                      ))}
-                    </Space>
-                  </Card>
-                )}
-              </Space>
-            ) : (
-              <Empty description="请选择章节查看详情" />
-            )}
-          </div>
-        </div>
-      </div>
-    );
-  };
-
-  // 处理批量预览确认
-  const handleBatchPreviewOk = async () => {
-    setBatchPreviewVisible(false);
-    await handleConfirmBatchCreateChapters();
-  };
-
-  // 处理批量预览取消
-  const handleBatchPreviewCancel = () => {
-    setBatchPreviewVisible(false);
-    message.info('已取消创建章节，规划已保存');
-  };
-
-
-  // 确认批量创建章节 - 使用缓存的规划数据
-  const handleConfirmBatchCreateChapters = async () => {
-    try {
-      setIsExpanding(true);
-
-      // 使用缓存的规划数据，避免重复调用AI
-      if (!cachedBatchExpansionResponse) {
-        message.error('规划数据丢失，请重新展开');
-        return;
-      }
-
-      console.log('✅ 使用缓存的批量规划数据创建章节，避免重复AI调用');
-
-      // 逐个大纲创建章节
-      let totalCreated = 0;
-      const errors: string[] = [];
-
-      for (const result of cachedBatchExpansionResponse.expansion_results) {
-        try {
-          // 使用create-chapters-from-plans接口，直接传递缓存的规划
-          const response = await outlineApi.createChaptersFromPlans(
-            result.outline_id,
-            result.chapter_plans
-          );
-          totalCreated += response.chapters_created;
-        } catch (error: unknown) {
-          const apiError = error as ApiError;
-          const err = error as Error;
-          const errorMsg = apiError.response?.data?.detail || err.message || '未知错误';
-          errors.push(`${result.outline_title}: ${errorMsg}`);
-          console.error(`创建大纲 ${result.outline_title} 的章节失败:`, error);
-        }
-      }
-
-      // 显示结果
-      if (errors.length === 0) {
-        message.success(
-          `批量创建完成！共创建 ${totalCreated} 个章节`,
-          3
-        );
-      } else {
-        message.warning(
-          `部分完成：成功创建 ${totalCreated} 个章节，${errors.length} 个失败`,
-          5
-        );
-        console.error('失败详情:', errors);
-      }
-
-      // 清除缓存
-      setCachedBatchExpansionResponse(null);
-
-      // 刷新列表
-      refreshOutlines();
-
-    } catch (error) {
-      console.error('批量创建章节失败:', error);
-      message.error('批量创建章节失败');
-    } finally {
-      setIsExpanding(false);
-    }
-  };
-
-
   return (
     <>
-      {/* 批量展开预览 Modal */}
-      <Modal
-        title={
-          <Space>
-            <CheckCircleOutlined style={{ color: token.colorSuccess }} />
-            <span>批量展开规划预览</span>
-          </Space>
-        }
-        open={batchPreviewVisible}
-        onOk={handleBatchPreviewOk}
-        onCancel={handleBatchPreviewCancel}
-        width={1200}
-        centered
-        okText="确认并批量创建章节"
-        cancelText="暂不创建"
-        okButtonProps={{ danger: true }}
-      >
-        {renderBatchPreviewContent()}
-      </Modal>
-
       {contextHolder}
-      {/* SSE进度Modal - 使用统一组件 */}
-      <SSEProgressModal
-        visible={sseModalVisible}
-        progress={sseProgress}
-        message={sseMessage}
-        title="AI生成中（后台运行，可关闭页面）..."
-        onCancel={() => {
-          setSSEModalVisible(false);
-          setIsExpanding(false);
-          message.info('已取消操作');
-        }}
-      />
 
       <div style={{ display: 'flex', flexDirection: 'column', height: '100%' }}>
         {/* 固定头部 */}
diff --git a/frontend/src/services/backgroundTaskService.ts b/frontend/src/services/backgroundTaskService.ts
index c62680d..5a8674e 100644
--- a/frontend/src/services/backgroundTaskService.ts
+++ b/frontend/src/services/backgroundTaskService.ts
@@ -13,9 +13,10 @@ export interface TaskStatus {
   status_message: string | null;
   progress_details: {
     stage: string;
-    message: string;
+    message?: string;
     current_chars?: number;
     retry_count?: number;
+    queue_size?: number;
   } | null;
   error_message: string | null;
   task_result: Record<string, unknown> | null;