diff --git a/api/app/routers/__init__.py b/api/app/routers/__init__.py
new file mode 100644
index 0000000..4d54495
--- /dev/null
+++ b/api/app/routers/__init__.py
@@ -0,0 +1,6 @@
+from .jokes import router as jokes_router
+from .categories import router as categories_router
+from .auth import router as auth_router
+from .admin import router as admin_router
+
+__all__ = ["jokes_router", "categories_router", "auth_router", "admin_router"]
\ No newline at end of file
diff --git a/api/app/routers/admin.py b/api/app/routers/admin.py
new file mode 100644
index 0000000..1f70ad0
--- /dev/null
+++ b/api/app/routers/admin.py
@@ -0,0 +1,272 @@
+from fastapi import APIRouter, Depends, HTTPException, Header
+from jose import JWTError, jwt
+from sqlalchemy import func
+from sqlalchemy.orm import Session
+
+from app.config import JWT_ALGORITHM, JWT_SECRET_KEY
+from app.database import get_db
+from app.models.joke import Joke
+from app.models.category import JokeCrowd, JokeType
+from app.models.user import AdminUser
+from app.schemas.category import JokeCrowdCreate, JokeCrowdResponse, JokeTypeCreate, JokeTypeResponse
+from app.schemas.joke import JokeCreate, JokeResponse, JokeUpdate, PaginatedJokeResponse
+
+router = APIRouter(prefix="/admin", tags=["管理后台"])
+
+
+def get_current_admin_user(
+    authorization: str = Header(None),
+    db: Session = Depends(get_db),
+) -> AdminUser:
+    """Dependency to get current authenticated admin user."""
+    if not authorization:
+        raise HTTPException(status_code=401, detail="未提供认证令牌")
+    parts = authorization.split()
+    if len(parts) != 2 or parts[0].lower() != "bearer":
+        raise HTTPException(status_code=401, detail="无效的认证格式")
+    token = parts[1]
+    try:
+        payload = jwt.decode(token, JWT_SECRET_KEY, algorithms=[JWT_ALGORITHM])
+        user_id = payload.get("sub")
+        if user_id is None:
+            raise HTTPException(status_code=401, detail="无效的令牌")
+    except JWTError:
+        raise HTTPException(status_code=401, detail="无效或过期的令牌")
+
+    user = db.query(AdminUser).filter(AdminUser.id == int(user_id)).first()
+    if not user:
+        raise HTTPException(status_code=401, detail="用户不存在")
+    return user
+
+
+def joke_to_response(joke: Joke) -> JokeResponse:
+    """Convert Joke model to JokeResponse schema."""
+    return JokeResponse(
+        id=joke.id,
+        title=joke.title,
+        content=joke.content,
+        type_id=joke.type_id,
+        crowd_id=joke.crowd_id,
+        status=joke.status,
+        view_count=joke.view_count,
+        like_count=joke.like_count,
+        created_at=joke.created_at,
+        updated_at=joke.updated_at,
+        type_name=joke.type.name if joke.type else None,
+        crowd_name=joke.crowd.name if joke.crowd else None,
+    )
+
+
+# Admin Jokes Routes
+@router.get("/jokes", response_model=PaginatedJokeResponse)
+def admin_list_jokes(
+    page: int = 1,
+    page_size: int = 20,
+    status: str = None,
+    db: Session = Depends(get_db),
+    current_user: AdminUser = Depends(get_current_admin_user),
+):
+    """获取所有笑话（支持状态筛选）"""
+    query = db.query(Joke)
+    if status:
+        query = query.filter(Joke.status == status)
+    total = query.count()
+    offset = (page - 1) * page_size
+    jokes = query.order_by(Joke.created_at.desc()).offset(offset).limit(page_size).all()
+    return PaginatedJokeResponse(
+        items=[joke_to_response(j) for j in jokes],
+        total=total,
+        page=page,
+        page_size=page_size,
+    )
+
+
+@router.post("/jokes", response_model=JokeResponse)
+def admin_create_joke(
+    joke: JokeCreate,
+    db: Session = Depends(get_db),
+    current_user: AdminUser = Depends(get_current_admin_user),
+):
+    """创建笑话"""
+    db_joke = Joke(**joke.model_dump())
+    db.add(db_joke)
+    db.commit()
+    db.refresh(db_joke)
+    return joke_to_response(db_joke)
+
+
+@router.put("/jokes/{joke_id}", response_model=JokeResponse)
+def admin_update_joke(
+    joke_id: int,
+    joke: JokeUpdate,
+    db: Session = Depends(get_db),
+    current_user: AdminUser = Depends(get_current_admin_user),
+):
+    """更新笑话"""
+    db_joke = db.query(Joke).filter(Joke.id == joke_id).first()
+    if not db_joke:
+        raise HTTPException(status_code=404, detail="笑话不存在")
+    update_data = joke.model_dump(exclude_unset=True)
+    for key, value in update_data.items():
+        setattr(db_joke, key, value)
+    db.commit()
+    db.refresh(db_joke)
+    return joke_to_response(db_joke)
+
+
+@router.delete("/jokes/{joke_id}")
+def admin_delete_joke(
+    joke_id: int,
+    db: Session = Depends(get_db),
+    current_user: AdminUser = Depends(get_current_admin_user),
+):
+    """删除笑话"""
+    db_joke = db.query(Joke).filter(Joke.id == joke_id).first()
+    if not db_joke:
+        raise HTTPException(status_code=404, detail="笑话不存在")
+    db.delete(db_joke)
+    db.commit()
+    return {"message": "删除成功"}
+
+
+@router.put("/jokes/batch-approve")
+def admin_batch_approve(
+    joke_ids: list[int],
+    db: Session = Depends(get_db),
+    current_user: AdminUser = Depends(get_current_admin_user),
+):
+    """批量审核通过笑话"""
+    jokes = db.query(Joke).filter(Joke.id.in_(joke_ids)).all()
+    for joke in jokes:
+        joke.status = "approved"
+    db.commit()
+    return {"message": f"已审核通过 {len(jokes)} 条笑话"}
+
+
+@router.get("/stats")
+def admin_stats(
+    db: Session = Depends(get_db),
+    current_user: AdminUser = Depends(get_current_admin_user),
+):
+    """获取统计数据"""
+    total_jokes = db.query(Joke).count()
+    approved_jokes = db.query(Joke).filter(Joke.status == "approved").count()
+    pending_jokes = db.query(Joke).filter(Joke.status == "pending").count()
+    total_views = db.query(Joke).with_entities(func.sum(Joke.view_count)).scalar() or 0
+    total_likes = db.query(Joke).with_entities(func.sum(Joke.like_count)).scalar() or 0
+    return {
+        "total_jokes": total_jokes,
+        "approved_jokes": approved_jokes,
+        "pending_jokes": pending_jokes,
+        "total_views": total_views,
+        "total_likes": total_likes,
+    }
+
+
+# Categories CRUD
+@router.post("/types", response_model=JokeTypeResponse)
+def admin_create_type(
+    joke_type: JokeTypeCreate,
+    db: Session = Depends(get_db),
+    current_user: AdminUser = Depends(get_current_admin_user),
+):
+    """创建笑话类型"""
+    db_type = JokeType(name=joke_type.name, icon=joke_type.icon, sort_order=joke_type.sort_order)
+    db.add(db_type)
+    db.commit()
+    db.refresh(db_type)
+    return JokeTypeResponse.model_validate(db_type)
+
+
+@router.put("/types/{type_id}", response_model=JokeTypeResponse)
+def admin_update_type(
+    type_id: int,
+    joke_type: JokeTypeResponse,
+    db: Session = Depends(get_db),
+    current_user: AdminUser = Depends(get_current_admin_user),
+):
+    """更新笑话类型"""
+    db_type = db.query(JokeType).filter(JokeType.id == type_id).first()
+    if not db_type:
+        raise HTTPException(status_code=404, detail="类型不存在")
+    db_type.name = joke_type.name
+    if joke_type.icon is not None:
+        db_type.icon = joke_type.icon
+    if joke_type.sort_order is not None:
+        db_type.sort_order = joke_type.sort_order
+    db.commit()
+    db.refresh(db_type)
+    return JokeTypeResponse.model_validate(db_type)
+
+
+@router.delete("/types/{type_id}")
+def admin_delete_type(
+    type_id: int,
+    db: Session = Depends(get_db),
+    current_user: AdminUser = Depends(get_current_admin_user),
+):
+    """删除笑话类型"""
+    db_type = db.query(JokeType).filter(JokeType.id == type_id).first()
+    if not db_type:
+        raise HTTPException(status_code=404, detail="类型不存在")
+    # Check if there are jokes using this type
+    joke_count = db.query(Joke).filter(Joke.type_id == type_id).count()
+    if joke_count > 0:
+        raise HTTPException(status_code=400, detail=f"有 {joke_count} 条笑话使用此类型，无法删除")
+    db.delete(db_type)
+    db.commit()
+    return {"message": "删除成功"}
+
+
+@router.post("/crowds", response_model=JokeCrowdResponse)
+def admin_create_crowd(
+    crowd: JokeCrowdCreate,
+    db: Session = Depends(get_db),
+    current_user: AdminUser = Depends(get_current_admin_user),
+):
+    """创建笑话人群分类"""
+    db_crowd = JokeCrowd(name=crowd.name, icon=crowd.icon, sort_order=crowd.sort_order)
+    db.add(db_crowd)
+    db.commit()
+    db.refresh(db_crowd)
+    return JokeCrowdResponse.model_validate(db_crowd)
+
+
+@router.put("/crowds/{crowd_id}", response_model=JokeCrowdResponse)
+def admin_update_crowd(
+    crowd_id: int,
+    crowd: JokeCrowdResponse,
+    db: Session = Depends(get_db),
+    current_user: AdminUser = Depends(get_current_admin_user),
+):
+    """更新笑话人群分类"""
+    db_crowd = db.query(JokeCrowd).filter(JokeCrowd.id == crowd_id).first()
+    if not db_crowd:
+        raise HTTPException(status_code=404, detail="人群分类不存在")
+    db_crowd.name = crowd.name
+    if crowd.icon is not None:
+        db_crowd.icon = crowd.icon
+    if crowd.sort_order is not None:
+        db_crowd.sort_order = crowd.sort_order
+    db.commit()
+    db.refresh(db_crowd)
+    return JokeCrowdResponse.model_validate(db_crowd)
+
+
+@router.delete("/crowds/{crowd_id}")
+def admin_delete_crowd(
+    crowd_id: int,
+    db: Session = Depends(get_db),
+    current_user: AdminUser = Depends(get_current_admin_user),
+):
+    """删除笑话人群分类"""
+    db_crowd = db.query(JokeCrowd).filter(JokeCrowd.id == crowd_id).first()
+    if not db_crowd:
+        raise HTTPException(status_code=404, detail="人群分类不存在")
+    # Check if there are jokes using this crowd
+    joke_count = db.query(Joke).filter(Joke.crowd_id == crowd_id).count()
+    if joke_count > 0:
+        raise HTTPException(status_code=400, detail=f"有 {joke_count} 条笑话使用此人群，无法删除")
+    db.delete(db_crowd)
+    db.commit()
+    return {"message": "删除成功"}
\ No newline at end of file
diff --git a/api/app/routers/auth.py b/api/app/routers/auth.py
new file mode 100644
index 0000000..90a043a
--- /dev/null
+++ b/api/app/routers/auth.py
@@ -0,0 +1,39 @@
+from datetime import datetime, timedelta, timezone
+
+from fastapi import APIRouter, Depends, HTTPException
+from jose import jwt
+from passlib.context import CryptContext
+from sqlalchemy.orm import Session
+
+from app.config import JWT_ALGORITHM, JWT_EXPIRATION_HOURS, JWT_SECRET_KEY
+from app.database import get_db
+from app.models.user import AdminUser
+from app.schemas.auth import LoginRequest, TokenResponse
+
+router = APIRouter(prefix="/auth", tags=["认证"])
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    """验证密码"""
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def create_access_token(data: dict) -> str:
+    """创建 JWT token"""
+    to_encode = data.copy()
+    expire = datetime.now(timezone.utc) + timedelta(hours=JWT_EXPIRATION_HOURS)
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, JWT_SECRET_KEY, algorithm=JWT_ALGORITHM)
+    return encoded_jwt
+
+
+@router.post("/login", response_model=TokenResponse)
+def login(req: LoginRequest, db: Session = Depends(get_db)):
+    """管理员登录"""
+    user = db.query(AdminUser).filter(AdminUser.username == req.username).first()
+    if not user or not verify_password(req.password, user.password_hash):
+        raise HTTPException(status_code=401, detail="用户名或密码错误")
+    access_token = create_access_token(data={"sub": str(user.id), "username": user.username})
+    return TokenResponse(access_token=access_token)
\ No newline at end of file
diff --git a/api/app/routers/categories.py b/api/app/routers/categories.py
new file mode 100644
index 0000000..fb70ba5
--- /dev/null
+++ b/api/app/routers/categories.py
@@ -0,0 +1,22 @@
+from fastapi import APIRouter, Depends
+from sqlalchemy.orm import Session
+
+from app.database import get_db
+from app.models.category import JokeCrowd, JokeType
+from app.schemas.category import JokeCrowdResponse, JokeTypeResponse
+
+router = APIRouter(prefix="/categories", tags=["分类"])
+
+
+@router.get("/types", response_model=list[JokeTypeResponse])
+def list_types(db: Session = Depends(get_db)):
+    """获取所有笑话类型"""
+    types = db.query(JokeType).order_by(JokeType.sort_order, JokeType.id).all()
+    return [JokeTypeResponse.model_validate(t) for t in types]
+
+
+@router.get("/crowds", response_model=list[JokeCrowdResponse])
+def list_crowds(db: Session = Depends(get_db)):
+    """获取所有笑话人群分类"""
+    crowds = db.query(JokeCrowd).order_by(JokeCrowd.sort_order, JokeCrowd.id).all()
+    return [JokeCrowdResponse.model_validate(c) for c in crowds]
\ No newline at end of file
diff --git a/api/app/routers/jokes.py b/api/app/routers/jokes.py
new file mode 100644
index 0000000..8a58d67
--- /dev/null
+++ b/api/app/routers/jokes.py
@@ -0,0 +1,78 @@
+import random
+
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy import func
+from sqlalchemy.orm import Session
+
+from app.database import get_db
+from app.models.joke import Joke
+from app.schemas.joke import JokeResponse, PaginatedJokeResponse
+
+router = APIRouter(prefix="/jokes", tags=["笑话"])
+
+
+def joke_to_response(joke: Joke) -> JokeResponse:
+    """Convert Joke model to JokeResponse schema."""
+    return JokeResponse(
+        id=joke.id,
+        title=joke.title,
+        content=joke.content,
+        type_id=joke.type_id,
+        crowd_id=joke.crowd_id,
+        status=joke.status,
+        view_count=joke.view_count,
+        like_count=joke.like_count,
+        created_at=joke.created_at,
+        updated_at=joke.updated_at,
+        type_name=joke.type.name if joke.type else None,
+        crowd_name=joke.crowd.name if joke.crowd else None,
+    )
+
+
+@router.get("/", response_model=PaginatedJokeResponse)
+def list_jokes(
+    page: int = 1,
+    page_size: int = 20,
+    type_id: int | None = None,
+    crowd_id: int | None = None,
+    db: Session = Depends(get_db),
+):
+    """获取笑话列表（仅返回已审核通过的笑话）"""
+    query = db.query(Joke).filter(Joke.status == "approved")
+
+    if type_id is not None:
+        query = query.filter(Joke.type_id == type_id)
+    if crowd_id is not None:
+        query = query.filter(Joke.crowd_id == crowd_id)
+
+    total = query.count()
+    offset = (page - 1) * page_size
+    jokes = query.order_by(Joke.created_at.desc()).offset(offset).limit(page_size).all()
+
+    return PaginatedJokeResponse(
+        items=[joke_to_response(j) for j in jokes],
+        total=total,
+        page=page,
+        page_size=page_size,
+    )
+
+
+@router.get("/{joke_id}", response_model=JokeResponse)
+def get_joke(joke_id: int, db: Session = Depends(get_db)):
+    """获取单条笑话详情"""
+    joke = db.query(Joke).filter(Joke.id == joke_id).first()
+    if not joke:
+        raise HTTPException(status_code=404, detail="笑话不存在")
+    # 增加浏览次数
+    joke.view_count += 1
+    db.commit()
+    return joke_to_response(joke)
+
+
+@router.get("/random", response_model=JokeResponse)
+def get_random_joke(db: Session = Depends(get_db)):
+    """随机获取一条已审核通过的笑话"""
+    joke = db.query(Joke).filter(Joke.status == "approved").order_by(func.random()).first()
+    if not joke:
+        raise HTTPException(status_code=404, detail="暂无笑话")
+    return joke_to_response(joke)
\ No newline at end of file
diff --git a/api/main.py b/api/main.py
index 2e6bc8c..a9c145f 100644
--- a/api/main.py
+++ b/api/main.py
@@ -2,6 +2,7 @@ from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
 from app.config import API_TITLE, API_VERSION
+from app.routers import jokes_router, categories_router, auth_router, admin_router
 
 # Create FastAPI application
 app = FastAPI(title=API_TITLE, version=API_VERSION)
@@ -15,6 +16,12 @@ app.add_middleware(
     allow_headers=["*"],
 )
 
+# Mount routers
+app.include_router(jokes_router)
+app.include_router(categories_router)
+app.include_router(auth_router)
+app.include_router(admin_router)
+
 
 @app.get("/")
 def root():