diff --git a/backend/app/api/chapters.py b/backend/app/api/chapters.py
index 1efb5ca..159d0bb 100644
--- a/backend/app/api/chapters.py
+++ b/backend/app/api/chapters.py
@@ -2543,7 +2543,7 @@ async def regenerate_chapter_stream(
         if not analysis:
             raise HTTPException(status_code=404, detail="该章节暂无分析结果")
     
-    # 预先获取项目上下文数据
+    # 预先获取项目上下文数据和写作风格
     async for temp_db in get_db(request):
         try:
             # 获取项目信息
@@ -2566,6 +2566,41 @@ async def regenerate_chapter_stream(
             )
             outline = outline_result.scalar_one_or_none()
             
+            # 获取写作风格
+            style_content = ""
+            style_id = regenerate_request.style_id
+            
+            # 如果没有指定风格，尝试使用项目的默认风格
+            if not style_id:
+                from app.models.project_default_style import ProjectDefaultStyle
+                default_style_result = await temp_db.execute(
+                    select(ProjectDefaultStyle.style_id)
+                    .where(ProjectDefaultStyle.project_id == chapter.project_id)
+                )
+                default_style_id = default_style_result.scalar_one_or_none()
+                if default_style_id:
+                    style_id = default_style_id
+                    logger.info(f"📝 使用项目默认写作风格: {style_id}")
+            
+            # 获取风格内容
+            if style_id:
+                style_result = await temp_db.execute(
+                    select(WritingStyle).where(WritingStyle.id == style_id)
+                )
+                style = style_result.scalar_one_or_none()
+                if style:
+                    # 验证风格是否可用：全局预设风格（project_id为NULL）或者当前项目的自定义风格
+                    if style.project_id is None or style.project_id == chapter.project_id:
+                        style_content = style.prompt_content or ""
+                        style_type = "全局预设" if style.project_id is None else "项目自定义"
+                        logger.info(f"✅ 使用写作风格: {style.name} ({style_type})")
+                    else:
+                        logger.warning(f"⚠️ 风格 {style_id} 不属于当前项目，跳过")
+                else:
+                    logger.warning(f"⚠️ 未找到风格 {style_id}")
+            else:
+                logger.info("ℹ️ 未指定写作风格，使用默认提示词")
+            
             # 构建项目上下文
             project_context = {
                 'project_title': project.title if project else '未知',
@@ -2635,7 +2670,8 @@ async def regenerate_chapter_stream(
                     chapter=chapter,
                     analysis=analysis,
                     regenerate_request=regenerate_request,
-                    project_context=project_context
+                    project_context=project_context,
+                    style_content=style_content
                 ):
                     # 处理不同类型的事件
                     if event['type'] == 'chunk':
diff --git a/backend/app/api/outlines.py b/backend/app/api/outlines.py
index 87552ea..883eac2 100644
--- a/backend/app/api/outlines.py
+++ b/backend/app/api/outlines.py
@@ -174,7 +174,7 @@ async def update_outline(
     request: Request,
     db: AsyncSession = Depends(get_db)
 ):
-    """更新大纲信息并同步更新structure字段"""
+    """更新大纲信息并同步更新structure字段和关联章节"""
     result = await db.execute(
         select(Outline).where(Outline.id == outline_id)
     )
@@ -185,7 +185,7 @@ async def update_outline(
     
     # 验证用户权限
     user_id = getattr(request.state, 'user_id', None)
-    await verify_project_access(outline.project_id, user_id, db)
+    project = await verify_project_access(outline.project_id, user_id, db)
     
     # 更新字段
     update_data = outline_update.model_dump(exclude_unset=True)
@@ -214,6 +214,28 @@ async def update_outline(
         except json.JSONDecodeError:
             logger.warning(f"大纲 {outline_id} 的structure字段格式错误，跳过更新")
     
+    # 🔧 传统模式（one-to-one）：同步更新关联章节的标题
+    if 'title' in update_data and project.outline_mode == 'one-to-one':
+        try:
+            # 查找对应的章节（通过chapter_number匹配order_index）
+            chapter_result = await db.execute(
+                select(Chapter).where(
+                    Chapter.project_id == outline.project_id,
+                    Chapter.chapter_number == outline.order_index
+                )
+            )
+            chapter = chapter_result.scalar_one_or_none()
+            
+            if chapter:
+                # 同步更新章节标题
+                chapter.title = outline.title
+                logger.info(f"一对一模式：同步更新章节 {chapter.id} 的标题为 '{outline.title}'")
+            else:
+                logger.debug(f"一对一模式：未找到对应的章节（chapter_number={outline.order_index}）")
+        except Exception as e:
+            logger.error(f"同步更新章节标题失败: {str(e)}")
+            # 不阻断大纲更新流程，仅记录错误
+    
     await db.commit()
     await db.refresh(outline)
     return outline
@@ -485,9 +507,21 @@ async def _generate_new_outline(
     # 解析响应
     outline_data = _parse_ai_response(ai_content)
     
-    # 全新生成模式：必须删除旧大纲（章节不自动删除，由用户手动管理）
-    # 注意：这是"new"模式的核心逻辑，应该始终删除旧数据
-    logger.info(f"删除项目 {project.id} 的旧大纲")
+    # 全新生成模式：删除旧大纲和关联的所有章节
+    logger.info(f"全新生成：删除项目 {project.id} 的旧大纲和章节")
+    
+    from sqlalchemy import delete as sql_delete
+    
+    # 无论是一对一还是一对多模式，都删除所有项目的章节
+    # 一对一模式：通过 chapter_number 关联
+    # 一对多模式：通过 outline_id 关联
+    delete_result = await db.execute(
+        sql_delete(Chapter).where(Chapter.project_id == project.id)
+    )
+    deleted_chapters_count = delete_result.rowcount
+    logger.info(f"全新生成：删除了 {deleted_chapters_count} 个旧章节")
+    
+    # 删除旧大纲
     await db.execute(
         delete(Outline).where(Outline.project_id == project.id)
     )
diff --git a/backend/app/api/writing_styles.py b/backend/app/api/writing_styles.py
index bbe2e9e..6295d6e 100644
--- a/backend/app/api/writing_styles.py
+++ b/backend/app/api/writing_styles.py
@@ -22,24 +22,12 @@ router = APIRouter(prefix="/writing-styles", tags=["writing-styles"])
 logger = get_logger(__name__)
 
 
-async def verify_project_access(project_id: str, user_id: str, db: AsyncSession) -> Project:
-    """验证用户是否有权访问指定项目"""
+def get_current_user_id(request: Request) -> str:
+    """获取当前登录用户ID"""
+    user_id = getattr(request.state, 'user_id', None)
     if not user_id:
         raise HTTPException(status_code=401, detail="未登录")
-    
-    result = await db.execute(
-        select(Project).where(
-            Project.id == project_id,
-            Project.user_id == user_id
-        )
-    )
-    project = result.scalar_one_or_none()
-    
-    if not project:
-        logger.warning(f"项目访问被拒绝: project_id={project_id}, user_id={user_id}")
-        raise HTTPException(status_code=404, detail="项目不存在或无权访问")
-    
-    return project
+    return user_id
 
 
 @router.get("/presets/list", response_model=List[dict])
@@ -68,14 +56,13 @@ async def create_writing_style(
     db: AsyncSession = Depends(get_db)
 ):
     """
-    创建新的写作风格
+    创建新的写作风格（用户级别）
     
     - **基于预设创建**：提供 preset_id，系统会自动填充预设内容
     - **完全自定义**：不提供 preset_id，需要手动填写所有字段
     """
-    # 验证用户权限
-    user_id = getattr(request.state, 'user_id', None)
-    await verify_project_access(style_data.project_id, user_id, db)
+    # 获取当前用户ID
+    user_id = get_current_user_id(request)
     
     # 如果基于预设创建，获取预设内容
     if style_data.preset_id:
@@ -98,16 +85,16 @@ async def create_writing_style(
             detail="name 和 prompt_content 是必填字段"
         )
     
-    # 获取当前最大 order_index
+    # 获取当前用户的最大 order_index
     count_result = await db.execute(
         select(func.count(WritingStyle.id))
-        .where(WritingStyle.project_id == style_data.project_id)
+        .where(WritingStyle.user_id == user_id)
     )
     max_order = count_result.scalar_one()
     
     # 创建风格记录
     new_style = WritingStyle(
-        project_id=style_data.project_id,
+        user_id=user_id,
         name=style_data.name,
         style_type=style_data.style_type or ("preset" if style_data.preset_id else "custom"),
         preset_id=style_data.preset_id,
@@ -123,7 +110,7 @@ async def create_writing_style(
     # 返回包含 is_default 字段的字典（新创建的风格默认不是默认风格）
     return {
         "id": new_style.id,
-        "project_id": new_style.project_id,
+        "user_id": new_style.user_id,
         "name": new_style.name,
         "style_type": new_style.style_type,
         "preset_id": new_style.preset_id,
@@ -136,6 +123,60 @@ async def create_writing_style(
     }
 
 
+@router.get("/user", response_model=WritingStyleListResponse)
+async def get_user_styles(
+    request: Request,
+    db: AsyncSession = Depends(get_db)
+):
+    """
+    获取用户的所有可用写作风格
+    
+    返回：全局预设风格 + 该用户的自定义风格
+    按 order_index 排序
+    """
+    # 获取当前用户ID
+    user_id = get_current_user_id(request)
+    
+    # 获取全局预设风格（user_id 为 NULL）
+    result = await db.execute(
+        select(WritingStyle)
+        .where(WritingStyle.user_id.is_(None))
+        .order_by(WritingStyle.order_index)
+    )
+    preset_styles = list(result.scalars().all())
+    
+    # 获取用户自定义风格
+    result = await db.execute(
+        select(WritingStyle)
+        .where(WritingStyle.user_id == user_id)
+        .order_by(WritingStyle.order_index)
+    )
+    custom_styles = list(result.scalars().all())
+    
+    # 合并：预设风格 + 自定义风格
+    all_styles = preset_styles + custom_styles
+    
+    # 转换为响应格式
+    styles_with_default = []
+    for style in all_styles:
+        style_dict = {
+            "id": style.id,
+            "user_id": style.user_id,
+            "name": style.name,
+            "style_type": style.style_type,
+            "preset_id": style.preset_id,
+            "description": style.description,
+            "prompt_content": style.prompt_content,
+            "order_index": style.order_index,
+            "created_at": style.created_at,
+            "updated_at": style.updated_at,
+            "is_default": False  # 用户级别不再需要默认风格标记
+        }
+        styles_with_default.append(style_dict)
+    
+    return {"styles": styles_with_default, "total": len(styles_with_default)}
+
+
 @router.get("/project/{project_id}", response_model=WritingStyleListResponse)
 async def get_project_styles(
     project_id: str,
@@ -143,14 +184,24 @@ async def get_project_styles(
     db: AsyncSession = Depends(get_db)
 ):
     """
-    获取项目的所有可用写作风格
+    获取项目可用的所有写作风格（保留用于向后兼容）
     
-    返回：全局预设风格 + 该项目的自定义风格
+    返回：全局预设风格 + 该用户的自定义风格
     按 order_index 排序，并标记哪个是当前项目的默认风格
     """
-    # 验证用户权限
-    user_id = getattr(request.state, 'user_id', None)
-    await verify_project_access(project_id, user_id, db)
+    # 获取当前用户ID
+    user_id = get_current_user_id(request)
+    
+    # 验证项目访问权限
+    result = await db.execute(
+        select(Project).where(
+            Project.id == project_id,
+            Project.user_id == user_id
+        )
+    )
+    project = result.scalar_one_or_none()
+    if not project:
+        raise HTTPException(status_code=404, detail="项目不存在或无权访问")
     
     # 获取该项目的默认风格ID
     result = await db.execute(
@@ -159,18 +210,18 @@ async def get_project_styles(
     )
     default_style_id = result.scalar_one_or_none()
     
-    # 获取全局预设风格（project_id 为 NULL）
+    # 获取全局预设风格（user_id 为 NULL）
     result = await db.execute(
         select(WritingStyle)
-        .where(WritingStyle.project_id.is_(None))
+        .where(WritingStyle.user_id.is_(None))
         .order_by(WritingStyle.order_index)
     )
     preset_styles = list(result.scalars().all())
     
-    # 获取项目自定义风格
+    # 获取用户自定义风格
     result = await db.execute(
         select(WritingStyle)
-        .where(WritingStyle.project_id == project_id)
+        .where(WritingStyle.user_id == user_id)
         .order_by(WritingStyle.order_index)
     )
     custom_styles = list(result.scalars().all())
@@ -183,7 +234,7 @@ async def get_project_styles(
     for style in all_styles:
         style_dict = {
             "id": style.id,
-            "project_id": style.project_id,
+            "user_id": style.user_id,
             "name": style.name,
             "style_type": style.style_type,
             "preset_id": style.preset_id,
@@ -221,7 +272,7 @@ async def get_writing_style(
     # 返回包含 is_default 字段的字典
     return {
         "id": style.id,
-        "project_id": style.project_id,
+        "user_id": style.user_id,
         "name": style.name,
         "style_type": style.style_type,
         "preset_id": style.preset_id,
@@ -247,6 +298,9 @@ async def update_writing_style(
     - 只能修改自定义风格
     - 不能修改全局预设风格
     """
+    # 获取当前用户ID
+    user_id = get_current_user_id(request)
+    
     result = await db.execute(
         select(WritingStyle).where(WritingStyle.id == style_id)
     )
@@ -255,12 +309,12 @@ async def update_writing_style(
         raise HTTPException(status_code=404, detail="写作风格不存在")
     
     # 检查是否为全局预设风格（不允许修改）
-    if style.project_id is None:
+    if style.user_id is None:
         raise HTTPException(status_code=403, detail="不能修改全局预设风格，只能修改自定义风格")
     
-    # 验证用户权限
-    user_id = getattr(request.state, 'user_id', None)
-    await verify_project_access(style.project_id, user_id, db)
+    # 验证用户权限（只能修改自己的风格）
+    if style.user_id != user_id:
+        raise HTTPException(status_code=403, detail="无权修改其他用户的风格")
     
     # 更新字段
     update_data = style_data.model_dump(exclude_unset=True)
@@ -284,7 +338,7 @@ async def update_writing_style(
     # 返回包含 is_default 字段的字典
     return {
         "id": style.id,
-        "project_id": style.project_id,
+        "user_id": style.user_id,
         "name": style.name,
         "style_type": style.style_type,
         "preset_id": style.preset_id,
@@ -311,6 +365,9 @@ async def delete_writing_style(
     - 不能删除默认风格（必须先设置其他风格为默认）
     - 删除后无法恢复
     """
+    # 获取当前用户ID
+    user_id = get_current_user_id(request)
+    
     result = await db.execute(
         select(WritingStyle).where(WritingStyle.id == style_id)
     )
@@ -319,12 +376,12 @@ async def delete_writing_style(
         raise HTTPException(status_code=404, detail="写作风格不存在")
     
     # 检查是否为全局预设风格（不允许删除）
-    if style.project_id is None:
+    if style.user_id is None:
         raise HTTPException(status_code=403, detail="不能删除全局预设风格，只能删除自定义风格")
     
-    # 验证用户权限
-    user_id = getattr(request.state, 'user_id', None)
-    await verify_project_access(style.project_id, user_id, db)
+    # 验证用户权限（只能删除自己的风格）
+    if style.user_id != user_id:
+        raise HTTPException(status_code=403, detail="无权删除其他用户的风格")
     
     # 检查是否有项目将其设置为默认风格
     result = await db.execute(
@@ -362,9 +419,19 @@ async def set_default_style(
     """
     project_id = request_data.project_id
     
-    # 验证用户权限
-    user_id = getattr(request.state, 'user_id', None)
-    await verify_project_access(project_id, user_id, db)
+    # 获取当前用户ID
+    user_id = get_current_user_id(request)
+    
+    # 验证项目访问权限
+    result = await db.execute(
+        select(Project).where(
+            Project.id == project_id,
+            Project.user_id == user_id
+        )
+    )
+    project = result.scalar_one_or_none()
+    if not project:
+        raise HTTPException(status_code=404, detail="项目不存在或无权访问")
     
     # 验证风格是否存在
     result = await db.execute(
@@ -374,9 +441,9 @@ async def set_default_style(
     if not style:
         raise HTTPException(status_code=404, detail="写作风格不存在")
     
-    # 验证风格是否属于该项目（自定义风格）或是全局预设风格
-    if style.project_id is not None and style.project_id != project_id:
-        raise HTTPException(status_code=403, detail="无权操作其他项目的风格")
+    # 验证风格是否属于该用户（自定义风格）或是全局预设风格
+    if style.user_id is not None and style.user_id != user_id:
+        raise HTTPException(status_code=403, detail="无权操作其他用户的风格")
     
     # 使用 UPSERT 逻辑：先删除该项目的旧默认风格记录，再插入新的
     await db.execute(
@@ -411,9 +478,5 @@ async def initialize_default_styles(
     新架构下，预设风格是全局的，不需要为每个项目单独初始化
     该接口保留用于兼容性，直接返回项目可用的所有风格
     """
-    # 验证用户权限
-    user_id = getattr(request.state, 'user_id', None)
-    await verify_project_access(project_id, user_id, db)
-    
-    # 直接返回项目可用的所有风格（全局预设 + 项目自定义）
+    # 直接返回项目可用的所有风格（全局预设 + 用户自定义）
     return await get_project_styles(project_id, request, db)
\ No newline at end of file
diff --git a/backend/app/models/writing_style.py b/backend/app/models/writing_style.py
index 8aa109f..2ac09e8 100644
--- a/backend/app/models/writing_style.py
+++ b/backend/app/models/writing_style.py
@@ -9,7 +9,7 @@ class WritingStyle(Base):
     __tablename__ = "writing_styles"
     
     id = Column(Integer, primary_key=True, autoincrement=True)
-    project_id = Column(String(36), ForeignKey("projects.id", ondelete="CASCADE"), nullable=True, comment="所属项目ID（NULL表示全局预设风格）")
+    user_id = Column(String(255), ForeignKey("users.user_id", ondelete="CASCADE"), nullable=True, comment="所属用户ID（NULL表示全局预设风格）")
     name = Column(String(100), nullable=False, comment="风格名称")
     style_type = Column(String(50), nullable=False, comment="风格类型：preset/custom")
     preset_id = Column(String(50), comment="预设风格ID：natural/classical/modern等")
@@ -20,4 +20,4 @@ class WritingStyle(Base):
     updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now(), comment="更新时间")
     
     def __repr__(self):
-        return f"<WritingStyle(id={self.id}, name={self.name}, project_id={self.project_id})>"
\ No newline at end of file
+        return f"<WritingStyle(id={self.id}, name={self.name}, user_id={self.user_id})>"
\ No newline at end of file
diff --git a/backend/app/schemas/writing_style.py b/backend/app/schemas/writing_style.py
index 81ace45..1311375 100644
--- a/backend/app/schemas/writing_style.py
+++ b/backend/app/schemas/writing_style.py
@@ -13,9 +13,13 @@ class WritingStyleBase(BaseModel):
     prompt_content: str = Field(..., description="风格提示词内容")
 
 
-class WritingStyleCreate(WritingStyleBase):
-    """创建写作风格（仅用于创建项目自定义风格）"""
-    project_id: str = Field(..., description="所属项目ID")
+class WritingStyleCreate(BaseModel):
+    """创建写作风格（仅用于创建用户自定义风格）"""
+    name: str = Field(..., description="风格名称")
+    style_type: Optional[str] = Field(None, description="风格类型：preset/custom")
+    preset_id: Optional[str] = Field(None, description="预设风格ID")
+    description: Optional[str] = Field(None, description="风格描述")
+    prompt_content: str = Field(..., description="风格提示词内容")
 
 
 class WritingStyleUpdate(BaseModel):
@@ -33,7 +37,7 @@ class SetDefaultStyleRequest(BaseModel):
 class WritingStyleResponse(BaseModel):
     """写作风格响应"""
     id: int
-    project_id: Optional[str] = None  # NULL 表示全局预设风格
+    user_id: Optional[str] = None  # NULL 表示全局预设风格
     name: str
     style_type: str
     preset_id: Optional[str] = None
diff --git a/backend/app/services/chapter_regenerator.py b/backend/app/services/chapter_regenerator.py
index 25cb4a1..657b97c 100644
--- a/backend/app/services/chapter_regenerator.py
+++ b/backend/app/services/chapter_regenerator.py
@@ -23,7 +23,8 @@ class ChapterRegenerator:
         chapter: Chapter,
         analysis: Optional[PlotAnalysis],
         regenerate_request: ChapterRegenerateRequest,
-        project_context: Dict[str, Any]
+        project_context: Dict[str, Any],
+        style_content: str = ""
     ) -> AsyncGenerator[Dict[str, Any], None]:
         """
         根据反馈重新生成章节（流式）
@@ -55,7 +56,8 @@ class ChapterRegenerator:
                 chapter=chapter,
                 modification_instructions=modification_instructions,
                 project_context=project_context,
-                regenerate_request=regenerate_request
+                regenerate_request=regenerate_request,
+                style_content=style_content
             )
             
             logger.info(f"🎯 提示词构建完成，开始AI生成")
@@ -161,7 +163,8 @@ class ChapterRegenerator:
         chapter: Chapter,
         modification_instructions: str,
         project_context: Dict[str, Any],
-        regenerate_request: ChapterRegenerateRequest
+        regenerate_request: ChapterRegenerateRequest,
+        style_content: str = ""
     ) -> str:
         """构建完整的重新生成提示词"""
         
@@ -235,6 +238,17 @@ class ChapterRegenerator:
 
 {project_context['previous_context']}
 
+---
+""")
+        
+        # 写作风格要求（如果提供）
+        if style_content:
+            prompt_parts.append(f"""## 🎨 写作风格要求
+
+{style_content}
+
+请在重新创作时严格遵循上述写作风格。
+
 ---
 """)
         
@@ -246,6 +260,7 @@ class ChapterRegenerator:
 3. **提升质量**：在节奏、情感、描写等方面明显优于原版
 4. **保留精华**：保持原章节中优秀的部分和关键情节
 5. **字数控制**：目标字数约{regenerate_request.target_word_count}字（可适当浮动±20%）
+{f'6. **风格一致**：严格按照上述写作风格进行创作' if style_content else ''}
 
 ---
 
diff --git a/backend/app/services/import_export_service.py b/backend/app/services/import_export_service.py
index 0a0f478..d4ed554 100644
--- a/backend/app/services/import_export_service.py
+++ b/backend/app/services/import_export_service.py
@@ -77,6 +77,7 @@ class ImportExportService:
             "chapter_count": project.chapter_count,
             "narrative_perspective": project.narrative_perspective,
             "character_count": project.character_count,
+            "outline_mode": project.outline_mode, 
             "user_id": project.user_id,
             "created_at": project.created_at.isoformat() if project.created_at else None,
         }
@@ -496,6 +497,7 @@ class ImportExportService:
                 chapter_count=project_data.get("chapter_count"),
                 narrative_perspective=project_data.get("narrative_perspective"),
                 character_count=project_data.get("character_count"),
+                outline_mode=project_data.get("outline_mode", "one-to-many"),  # ✅ 导入大纲模式，默认为一对多
                 current_words=project_data.get("current_words", 0),  # 保留原项目的字数
                 wizard_step=4,  # 导入的项目设置为向导完成状态
                 wizard_status="completed"  # 标记向导已完成
diff --git a/backend/scripts/migrate_writing_styles_to_user_level.sql b/backend/scripts/migrate_writing_styles_to_user_level.sql
new file mode 100644
index 0000000..07a1c3a
--- /dev/null
+++ b/backend/scripts/migrate_writing_styles_to_user_level.sql
@@ -0,0 +1,36 @@
+-- 迁移写作风格从项目级别到用户级别
+-- 将 writing_styles 表的 project_id 字段改为 user_id
+
+-- 步骤1: 添加新的 user_id 字段
+ALTER TABLE writing_styles ADD COLUMN user_id VARCHAR(255);
+
+-- 步骤2: 将现有数据从 project_id 映射到 user_id
+-- 通过 projects 表关联，将项目的用户ID填充到风格的 user_id
+UPDATE writing_styles ws
+SET user_id = (
+    SELECT p.user_id 
+    FROM projects p 
+    WHERE p.id = ws.project_id
+)
+WHERE ws.project_id IS NOT NULL;
+
+-- 步骤3: 添加外键约束
+ALTER TABLE writing_styles
+ADD CONSTRAINT fk_writing_styles_user
+FOREIGN KEY (user_id) REFERENCES users(user_id) ON DELETE CASCADE;
+
+-- 步骤4: 删除旧的 project_id 外键约束
+ALTER TABLE writing_styles DROP CONSTRAINT IF EXISTS writing_styles_project_id_fkey;
+
+-- 步骤5: 删除 project_id 列
+ALTER TABLE writing_styles DROP COLUMN project_id;
+
+-- 步骤6: 更新注释
+COMMENT ON COLUMN writing_styles.user_id IS '所属用户ID（NULL表示全局预设风格）';
+
+-- 验证迁移结果
+SELECT 
+    COUNT(*) as total_styles,
+    COUNT(user_id) as user_styles,
+    COUNT(*) FILTER (WHERE user_id IS NULL) as preset_styles
+FROM writing_styles;
diff --git a/frontend/src/pages/Outline.tsx b/frontend/src/pages/Outline.tsx
index 2836569..63709f0 100644
--- a/frontend/src/pages/Outline.tsx
+++ b/frontend/src/pages/Outline.tsx
@@ -1464,7 +1464,10 @@ export default function Outline() {
                     title={
                       <Space size="small" style={{ fontSize: isMobile ? 14 : 16, flexWrap: 'wrap' }}>
                         <span style={{ color: '#1890ff', fontWeight: 'bold' }}>
-                          第{item.order_index || '?'}卷
+                          {currentProject?.outline_mode === 'one-to-one'
+                            ? `第${item.order_index || '?'}章`
+                            : `第${item.order_index || '?'}卷`
+                          }
                         </span>
                         <span>{item.title}</span>
                         {/* ✅ 新增：展开状态标识 - 仅在一对多模式显示 */}
diff --git a/frontend/src/pages/WritingStyles.tsx b/frontend/src/pages/WritingStyles.tsx
index 09f70cf..1ff4af6 100644
--- a/frontend/src/pages/WritingStyles.tsx
+++ b/frontend/src/pages/WritingStyles.tsx
@@ -51,26 +51,29 @@ export default function WritingStyles() {
     xl: 6,
   };
 
-  // 加载项目风格
+  // 加载风格列表 - 如果有项目则加载项目风格（包含默认标记），否则加载用户风格
   useEffect(() => {
-    if (currentProject?.id) {
-      loadProjectStyles();
-    }
+    loadStyles();
   }, [currentProject?.id]);
 
-  const loadProjectStyles = async () => {
-    if (!currentProject?.id) return;
-    
+  const loadStyles = async () => {
     try {
       setLoading(true);
-      const response = await writingStyleApi.getProjectStyles(currentProject.id);
-      // 对风格列表进行排序：默认风格优先，然后按原有顺序
+      // 如果有当前项目，使用项目API获取（包含is_default标记）
+      // 否则使用用户API获取（所有风格的is_default都是false）
+      const response = currentProject?.id
+        ? await writingStyleApi.getProjectStyles(currentProject.id)
+        : await writingStyleApi.getUserStyles();
+      
+      // 排序：默认风格优先显示
       const sortedStyles = (response.styles || []).sort((a, b) => {
-        // 默认风格排在前面
+        // 默认风格排在最前面
         if (a.is_default && !b.is_default) return -1;
         if (!a.is_default && b.is_default) return 1;
+        // 其他按原有顺序（order_index）
         return 0;
       });
+      
       setStyles(sortedStyles);
     } catch {
       message.error('加载风格列表失败');
@@ -80,11 +83,8 @@ export default function WritingStyles() {
   };
 
   const handleCreate = async (values: { name: string; description?: string; prompt_content: string }) => {
-    if (!currentProject?.id) return;
-
     try {
       const createData: WritingStyleCreate = {
-        project_id: currentProject.id,
         name: values.name,
         style_type: 'custom',
         description: values.description,
@@ -95,7 +95,7 @@ export default function WritingStyles() {
       message.success('创建成功');
       setIsCreateModalOpen(false);
       createForm.resetFields();
-      await loadProjectStyles();
+      await loadStyles();
     } catch {
       message.error('创建失败');
     }
@@ -120,7 +120,7 @@ export default function WritingStyles() {
       setIsEditModalOpen(false);
       editForm.resetFields();
       setEditingStyle(null);
-      await loadProjectStyles();
+      await loadStyles();
     } catch {
       message.error('更新失败');
     }
@@ -130,19 +130,22 @@ export default function WritingStyles() {
     try {
       await writingStyleApi.deleteStyle(styleId);
       message.success('删除成功');
-      await loadProjectStyles();
+      await loadStyles();
     } catch {
       message.error('删除失败');
     }
   };
 
   const handleSetDefault = async (styleId: number) => {
-    if (!currentProject?.id) return;
+    if (!currentProject?.id) {
+      message.warning('请先选择项目');
+      return;
+    }
     
     try {
       await writingStyleApi.setDefaultStyle(styleId, currentProject.id);
       message.success('设置默认风格成功');
-      await loadProjectStyles();
+      await loadStyles();
     } catch {
       message.error('设置失败');
     }
@@ -153,8 +156,6 @@ export default function WritingStyles() {
     setIsCreateModalOpen(true);
   };
 
-  if (!currentProject) return null;
-
   const getStyleTypeColor = (styleType: string) => {
     return styleType === 'preset' ? 'blue' : 'purple';
   };
@@ -240,13 +241,13 @@ export default function WritingStyles() {
                         )}
                       </span>
                     </Tooltip>,
-                    <Tooltip key="edit" title={style.project_id === null ? '预设风格不可编辑' : '编辑'}>
+                    <Tooltip key="edit" title={style.user_id === null ? '预设风格不可编辑' : '编辑'}>
                       <EditOutlined
-                        onClick={() => style.project_id !== null && handleEdit(style)}
+                        onClick={() => style.user_id !== null && handleEdit(style)}
                         style={{
                           fontSize: 18,
-                          cursor: style.project_id === null ? 'not-allowed' : 'pointer',
-                          color: style.project_id === null ? '#ccc' : undefined
+                          cursor: style.user_id === null ? 'not-allowed' : 'pointer',
+                          color: style.user_id === null ? '#ccc' : undefined
                         }}
                       />
                     </Tooltip>,
@@ -257,20 +258,18 @@ export default function WritingStyles() {
                       onConfirm={() => handleDelete(style.id)}
                       okText="确定"
                       cancelText="取消"
-                      disabled={style.project_id === null || styles.length === 1}
+                      disabled={style.user_id === null}
                     >
                       <Tooltip title={
-                        style.project_id === null
+                        style.user_id === null
                           ? '预设风格不可删除'
-                          : styles.length === 1
-                            ? '至少保留一个风格'
-                            : '删除'
+                          : '删除'
                       }>
                         <DeleteOutlined
                           style={{
                             fontSize: 18,
-                            color: (style.project_id === null || styles.length === 1) ? '#ccc' : undefined,
-                            cursor: (style.project_id === null || styles.length === 1) ? 'not-allowed' : 'pointer'
+                            color: style.user_id === null ? '#ccc' : undefined,
+                            cursor: style.user_id === null ? 'not-allowed' : 'pointer'
                           }}
                         />
                       </Tooltip>
diff --git a/frontend/src/services/api.ts b/frontend/src/services/api.ts
index c90978c..04cd2f1 100644
--- a/frontend/src/services/api.ts
+++ b/frontend/src/services/api.ts
@@ -437,7 +437,11 @@ export const writingStyleApi = {
   getPresetStyles: () =>
     api.get<unknown, PresetStyle[]>('/writing-styles/presets/list'),
   
-  // 获取项目的所有风格
+  // 获取用户的所有风格（新接口）
+  getUserStyles: () =>
+    api.get<unknown, WritingStyleListResponse>('/writing-styles/user'),
+  
+  // 获取项目的所有风格（保留向后兼容）
   getProjectStyles: (projectId: string) =>
     api.get<unknown, WritingStyleListResponse>(`/writing-styles/project/${projectId}`),
   
diff --git a/frontend/src/types/index.ts b/frontend/src/types/index.ts
index 0f91931..437c401 100644
--- a/frontend/src/types/index.ts
+++ b/frontend/src/types/index.ts
@@ -406,7 +406,7 @@ export interface ApiResponse<T> {
 // 写作风格类型定义
 export interface WritingStyle {
   id: number;
-  project_id: string;
+  user_id: string | null;  // NULL 表示全局预设风格
   name: string;
   style_type: 'preset' | 'custom';
   preset_id?: string;
@@ -419,13 +419,11 @@ export interface WritingStyle {
 }
 
 export interface WritingStyleCreate {
-  project_id: string;
   name: string;
-  style_type: 'preset' | 'custom';
+  style_type?: 'preset' | 'custom';
   preset_id?: string;
   description?: string;
   prompt_content: string;
-  is_default?: boolean;
 }
 
 export interface WritingStyleUpdate {