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diff --git a/app/crud.py b/app/crud.py
new file mode 100644
index 0000000..f5ea976
--- /dev/null
+++ b/app/crud.py
@@ -0,0 +1,37 @@
+from sqlalchemy.orm import Session
+from app import models, schemas
+from sqlalchemy.exc import IntegrityError
+from fastapi import HTTPException
+
+def get_user(db: Session, user_id: int):
+    return db.query(models.User).filter(models.User.id == user_id).first()
+
+def get_user_by_openid_or_wxid(db: Session, identifier: str):
+    return db.query(models.User).filter((models.User.openid == identifier) | (models.User.wxid == identifier)).first()
+
+def get_users(db: Session, skip: int = 0, limit: int = 10):
+    return db.query(models.User).offset(skip).limit(limit).all()
+
+def create_user(db: Session, user: schemas.UserCreate):
+    db_user = models.User(**user.dict())
+    try:
+        db.add(db_user)
+        db.commit()
+        db.refresh(db_user)
+    except IntegrityError:
+        db.rollback()
+        # wxid的唯一性
+        raise HTTPException(status_code=400, detail="wxid must be unique")
+    return db_user
+
+def delete_user(db: Session, user: models.User):
+    db.delete(user)
+    db.commit()
+    return user
+
+def update_user(db: Session, user: models.User, user_update: schemas.UserUpdate):
+    for key, value in user_update.dict(exclude_unset=True).items():
+        setattr(user, key, value)
+    db.commit()
+    db.refresh(user)
+    return user
diff --git a/app/database.py b/app/database.py
new file mode 100644
index 0000000..331a877
--- /dev/null
+++ b/app/database.py
@@ -0,0 +1,11 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+SQLALCHEMY_DATABASE_URL = "sqlite:///./test.db"
+
+engine = create_engine(SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False})
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()
diff --git a/app/main.py b/app/main.py
new file mode 100644
index 0000000..02f1197
--- /dev/null
+++ b/app/main.py
@@ -0,0 +1,61 @@
+from fastapi import FastAPI, HTTPException, Depends
+from sqlalchemy.orm import Session
+from typing import List, Optional
+
+from app import models, schemas, crud
+from app.database import SessionLocal, engine
+
+# 初始化数据库
+models.Base.metadata.create_all(bind=engine)
+
+app = FastAPI()
+
+# 依赖注入
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+@app.get("/add", response_model=schemas.User)
+def add_user(
+    nickname: Optional[str] = None,
+    remark: Optional[str] = None,
+    wechat_number: Optional[str] = None,
+    wxid: Optional[str] = None,
+    gender: Optional[str] = None,
+    friend_add_time: Optional[str] = None,
+    openid: Optional[str] = None,
+    db: Session = Depends(get_db)
+):
+    return crud.create_user(db=db, user=schemas.UserCreate(
+        nickname=nickname, remark=remark, wechat_number=wechat_number,
+        wxid=wxid, gender=gender, friend_add_time=friend_add_time,
+        openid=openid))
+
+@app.get("/users/", response_model=List[schemas.User])
+def read_users(skip: int = 0, limit: int = 10, db: Session = Depends(get_db)):
+    return crud.get_users(db=db, skip=skip, limit=limit)
+
+@app.get("/user/{identifier}", response_model=schemas.User)
+def read_user(identifier: str, db: Session = Depends(get_db)):
+    user = crud.get_user_by_openid_or_wxid(db, identifier=identifier)
+    if user is None:
+        raise HTTPException(status_code=404, detail="User not found")
+    return user
+
+@app.delete("/user/{user_id}", response_model=schemas.User)
+def delete_user(user_id: int, db: Session = Depends(get_db)):
+    user = crud.get_user(db=db, user_id=user_id)
+    if user is None:
+        raise HTTPException(status_code=404, detail="User not found")
+    return crud.delete_user(db=db, user=user)
+
+@app.put("/user/{identifier}", response_model=schemas.User)
+def update_user(identifier: str, user_update: schemas.UserUpdate, db: Session = Depends(get_db)):
+    user = crud.get_user_by_openid_or_wxid(db, identifier=identifier)
+    if user is None:
+        raise HTTPException(status_code=404, detail="User not found")
+    
+    return crud.update_user(db=db, user=user, user_update=user_update)
\ No newline at end of file
diff --git a/app/models.py b/app/models.py
new file mode 100644
index 0000000..afd64de
--- /dev/null
+++ b/app/models.py
@@ -0,0 +1,14 @@
+from sqlalchemy import Column, Integer, String
+from app.database import Base
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    nickname = Column(String, index=True)
+    remark = Column(String)
+    wechat_number = Column(String)
+    wxid = Column(String, index=True, unique=True)
+    gender = Column(String)
+    friend_add_time = Column(String)
+    openid = Column(String, index=True)
diff --git a/app/schemas.py b/app/schemas.py
new file mode 100644
index 0000000..9a3a9d3
--- /dev/null
+++ b/app/schemas.py
@@ -0,0 +1,23 @@
+from pydantic import BaseModel
+from typing import Optional
+
+class UserBase(BaseModel):
+    nickname: Optional[str] = None
+    remark: Optional[str] = None
+    wechat_number: Optional[str] = None
+    wxid: Optional[str] = None
+    gender: Optional[str] = None
+    friend_add_time: Optional[str] = None
+    openid: Optional[str] = None
+
+class UserCreate(UserBase):
+    pass
+
+class UserUpdate(UserBase):
+    pass
+
+class User(UserBase):
+    id: int
+
+    class Config:
+        orm_mode = True
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..a70e8ac
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,4 @@
+fastapi
+uvicorn
+sqlalchemy
+pydantic
\ No newline at end of file
diff --git a/run.py b/run.py
new file mode 100644
index 0000000..4753965
--- /dev/null
+++ b/run.py
@@ -0,0 +1,4 @@
+import uvicorn
+
+if __name__ == "__main__":
+    uvicorn.run("app.main:app", host="127.0.0.1", port=8000, reload=True)