diff --git a/backend/app/api/projects.py b/backend/app/api/projects.py
index 5e35280..3fc5848 100644
--- a/backend/app/api/projects.py
+++ b/backend/app/api/projects.py
@@ -14,6 +14,10 @@ from app.models.chapter import Chapter
 from app.models.generation_history import GenerationHistory
 from app.models.relationship import CharacterRelationship, Organization, OrganizationMember
 from app.models.memory import StoryMemory, PlotAnalysis
+from app.models.foreshadow import Foreshadow
+from app.models.career import Career, CharacterCareer
+from app.models.analysis_task import AnalysisTask
+from app.models.batch_generation_task import BatchGenerationTask
 from app.schemas.project import (
     ProjectCreate,
     ProjectUpdate,
@@ -234,11 +238,15 @@ async def delete_project(
         else:
             logger.warning(f"⚠️ 未找到用户ID，跳过向量数据库清理")
         
+        # === 删除所有关联数据（SQLite默认不启用外键约束，需要显式删除）===
+        
+        # 1. 删除角色关系
         relationships_result = await db.execute(
             delete(CharacterRelationship).where(CharacterRelationship.project_id == project_id)
         )
         logger.debug(f"删除角色关系数: {relationships_result.rowcount}")
         
+        # 2. 删除组织成员和组织
         orgs_result = await db.execute(
             select(Organization).where(Organization.project_id == project_id)
         )
@@ -256,29 +264,73 @@ async def delete_project(
         )
         logger.debug(f"删除组织数: {organizations_result.rowcount}")
         
+        # 3. 删除生成历史
         history_result = await db.execute(
             delete(GenerationHistory).where(GenerationHistory.project_id == project_id)
         )
         logger.debug(f"删除生成历史数: {history_result.rowcount}")
         
+        # 4. 删除分析任务
+        analysis_tasks_result = await db.execute(
+            delete(AnalysisTask).where(AnalysisTask.project_id == project_id)
+        )
+        logger.debug(f"删除分析任务数: {analysis_tasks_result.rowcount}")
+        
+        # 5. 删除批量生成任务
+        batch_tasks_result = await db.execute(
+            delete(BatchGenerationTask).where(BatchGenerationTask.project_id == project_id)
+        )
+        logger.debug(f"删除批量生成任务数: {batch_tasks_result.rowcount}")
+        
+        # 6. 删除角色职业关联（先获取角色ID列表）
+        characters_query = await db.execute(
+            select(Character.id).where(Character.project_id == project_id)
+        )
+        character_ids = [row[0] for row in characters_query.fetchall()]
+        
+        if character_ids:
+            character_careers_result = await db.execute(
+                delete(CharacterCareer).where(CharacterCareer.character_id.in_(character_ids))
+            )
+            logger.debug(f"删除角色职业关联数: {character_careers_result.rowcount}")
+        
+        # 7. 删除职业体系
+        careers_result = await db.execute(
+            delete(Career).where(Career.project_id == project_id)
+        )
+        logger.debug(f"删除职业体系数: {careers_result.rowcount}")
+        
+        # 8. 删除故事记忆
+        story_memories_result = await db.execute(
+            delete(StoryMemory).where(StoryMemory.project_id == project_id)
+        )
+        logger.debug(f"删除故事记忆数: {story_memories_result.rowcount}")
+        
+        # 9. 删除章节（会级联删除 PlotAnalysis）
         chapters_result = await db.execute(
             delete(Chapter).where(Chapter.project_id == project_id)
         )
         logger.debug(f"删除章节数: {chapters_result.rowcount}")
         
+        # 10. 删除大纲
         outlines_result = await db.execute(
             delete(Outline).where(Outline.project_id == project_id)
         )
         logger.debug(f"删除大纲数: {outlines_result.rowcount}")
         
+        # 11. 删除角色
         characters_result = await db.execute(
             delete(Character).where(Character.project_id == project_id)
         )
         logger.debug(f"删除角色数: {characters_result.rowcount}")
         
-        # 注意：StoryMemory和PlotAnalysis会通过数据库级联删除自动清理
-        # 但向量数据库已在上面手动清理
+        # 12. 删除伏笔
+        foreshadows_result = await db.execute(
+            delete(Foreshadow).where(Foreshadow.project_id == project_id)
+        )
+        logger.debug(f"删除伏笔数: {foreshadows_result.rowcount}")
         
+        # 最后删除项目本身
         await db.delete(project)
         await db.commit()