diff --git a/api/student.py b/api/student.py
index 99daec7..996c47a 100644
--- a/api/student.py
+++ b/api/student.py
@@ -1,14 +1,96 @@
-from fastapi import APIRouter,Depends,HTTPException
+from fastapi import APIRouter, Depends, HTTPException
 from sqlalchemy.orm import Session
-from dao.student import *
-from schemas.student import StudentCreate
 
+from core.database import get_db
+from schemas.student import StudentCreate, StudentUpdate
+from dao import student as student_dao
 student_router = APIRouter()
 
-@student_router.post("/student")
-def create_student(request:StudentCreate,db:Session=Depends(create_students)):
+@student_router.post("",summary='添加学生')
+def create_student(request:StudentCreate,db:Session = Depends(get_db)):
     d = request.model_dump()
-    r = create_students(d,db)
+    r = student_dao.create_students(d,db)
     if not r:
         raise HTTPException(status_code=500,detail='服务器繁忙，请稍后添加！')
-    return {'code':200,'detail':"添加学生成功"}
\ No newline at end of file
+    return {'code':200,'detail':"添加学生成功"}
+
+@student_router.put("/{id}", summary="修改学生")
+def update_student(
+    id: int,
+    request: StudentUpdate,
+    db: Session = Depends(get_db),
+):
+    # 只取前端真正传来的字段
+    # 例如只传 age，就只修改 age
+    data = request.model_dump(exclude_unset=True)
+
+    student = student_dao.update_student(id, data, db)
+
+    # None 表示学生不存在
+    if student is None:
+        raise HTTPException(status_code=404, detail="学生不存在")
+
+    # False 表示操作数据库失败
+    if student is False:
+        raise HTTPException(status_code=500, detail="修改学生失败")
+
+    return {
+        "code": 200,
+        "detail": "修改学生成功",
+        "data": student,
+    }
+
+@student_router.get("", summary="查询学生列表")
+def get_students(
+    # 三个查询条件都可以不传
+    student_no: str | None = None,
+    student_name: str | None = None,
+    class_id: int | None = None,
+    # 获取本次请求使用的数据库连接
+    db: Session = Depends(get_db),
+):
+    # 调用 DAO 查询数据库
+    students = student_dao.get_students(
+        db=db,
+        student_no=student_no,
+        student_name=student_name,
+        class_id=class_id,
+    )
+
+    return {
+        "code": 200,
+        "detail": "查询成功",
+        "total": len(students),
+        "data": students,
+    }
+
+@student_router.get("/{id}", summary="查询学生详情")
+def get_student(id: int, db: Session = Depends(get_db)):
+    # 根据路径中的 ID 查询学生
+    student = student_dao.get_student_by_id(id, db)
+
+    if not student:
+        # 404 表示请求的数据不存在
+        raise HTTPException(status_code=404, detail="学生不存在")
+
+    return {
+        "code": 200,
+        "detail": "查询成功",
+        "data": student,
+    }
+
+@student_router.delete("/{id}", summary="逻辑删除学生")
+def delete_student(id: int, db: Session = Depends(get_db)):
+    student = student_dao.delete_student(id, db)
+
+    # None 表示不存在，或者以前已经删除
+    if student is None:
+        raise HTTPException(status_code=404, detail="学生不存在或已经删除")
+
+    if student is False:
+        raise HTTPException(status_code=500, detail="删除学生失败")
+
+    return {
+        "code": 200,
+        "detail": "删除学生成功",
+    }
diff --git a/dao/student.py b/dao/student.py
index 9014fe5..e11ce68 100644
--- a/dao/student.py
+++ b/dao/student.py
@@ -1,16 +1,103 @@
 from schemas.student import *
 from core.database import get_db
 from models.student import *
-from utils.code_generator import generate_no
+from sqlalchemy.orm import Session
 
 
-def create_students(d,db):
+def create_students(d: dict, db: Session):
     stu = Student(**d)
+
     try:
         db.add(stu)
-        generate_no("student_no", "STU", stu, db)
+        #  把 SQL 发给数据库执行
+        db.flush()
+        # 根据 id 生成学生编号
+        if not stu.student_no:
+            stu.student_no = f"STU{stu.id:04d}"
         db.commit()
-    except:return False
-    else:
-        return True
+        db.refresh(stu)
+        return stu
+    except Exception as e:
+        db.rollback()
+        print(f"插入学生失败: {e}")
+        return None
+
+def get_student_by_id(student_id: int, db: Session):
+    # 同时判断 is_deleted，已经逻辑删除的学生不会被查到
+    return db.query(Student).filter(
+        Student.id == student_id,
+        Student.is_deleted == 0,
+    ).first()
+
+def update_student(student_id: int, data: dict, db: Session):
+    # 第一步：先查询学生
+    student = get_student_by_id(student_id, db)
+
+    # 没有查到就返回 None
+    if not student:
+        return None
+
+    try:
+        # 第二步：循环修改前端传来的字段
+        # field 是字段名，value 是新的值
+        for field, value in data.items():
+            setattr(student, field, value)
+
+        # 第三步：提交修改并重新读取数据
+        db.commit()
+        db.refresh(student)
+        return student
+
+    except Exception as e:
+        # 修改失败时回滚
+        db.rollback()
+        print("修改学生失败：", e)
+        return False
+
+def get_students(
+    db: Session,
+    student_no: str | None = None,
+    student_name: str | None = None,
+    class_id: int | None = None,
+):
+    # 第一步：只查询没有被删除的学生
+    query = db.query(Student).filter(Student.is_deleted == 0)
+
+    # 第二步：前端传了哪个条件，就增加哪个条件
+    if student_no:
+        # 学号使用精确查询
+        query = query.filter(Student.student_no == student_no)
+
+    if student_name:
+        # 姓名使用模糊查询，例如“张”可以查到“张三”
+        query = query.filter(Student.student_name.like(f"%{student_name}%"))
+
+    if class_id:
+        # 班级 ID 使用精确查询
+        query = query.filter(Student.class_id == class_id)
+
+    # 第三步：执行查询并返回全部结果
+    return query.all()
+
+#逻辑删除学生
+def delete_student(student_id: int, db: Session):
+    # 第一步：查询学生
+    student = get_student_by_id(student_id, db)
+
+    if not student:
+        return None
+
+    try:
+        # 第二步：不真正删除记录，只把删除标记改成 1
+        student.is_deleted = 1
+
+        # 第三步：提交修改
+        db.commit()
+        return student
+
+    except Exception as e:
+        # 删除失败时回滚
+        db.rollback()
+        print("删除学生失败：", e)
+        return False
 
diff --git a/database.py b/database.py
index ecff48f..7ee23b9 100644
--- a/database.py
+++ b/database.py
@@ -10,4 +10,4 @@ engine = create_engine(db_url
 
 Base.metadata.create_all(engine)
 db = SessionLocal()
-db.commit()
\ No newline at end of file
+db.commit() #创建全部表
\ No newline at end of file
diff --git a/main.py b/main.py
index e136053..a145808 100644
--- a/main.py
+++ b/main.py
@@ -1,7 +1,7 @@
 from fastapi import FastAPI
 from api.example import example_router
 from middleware import log_middleware
-from api.statistics import statistics_router
+# from api.statistics import statistics_router
 import uvicorn
 from api.student import student_router
 app = FastAPI()
@@ -12,15 +12,15 @@ from api.class_api import classes_router
 app.include_router(classes_router,tags=['班级接口'],prefix="/classes")
 
 #-------------李玉杰--------------
-app.include_router(student_router)
+app.include_router(student_router,tags=['学生接口'],prefix="/students")
 #-------------张义---------------
 
 #-------------薄鑫---------------
 from api import consultant
 app.include_router(consultant.router)
 #-------------张昕浩---------------
-app.include_router(example_router)
-app.include_router(statistics_router, prefix="/statistics")
+# app.include_router(example_router)
+# app.include_router(statistics_router, prefix="/statistics")
 
 #-------------曾凯---------------
 
diff --git a/models/student.py b/models/student.py
index ab805e4..fc73e95 100644
--- a/models/student.py
+++ b/models/student.py
@@ -10,7 +10,8 @@ class Student(Base):
                 , comment = '学生编号，自增主键'
                 )
     student_no = Column(VARCHAR(50)
-                        , unique = True)
+                        ,nullable = True
+                        ,unique = True)
     student_name = Column(VARCHAR(50))
     class_id = Column(Integer
                       ,ForeignKey('class_info_detail.id')
diff --git a/schemas/student.py b/schemas/student.py
index d4a044a..47f9b13 100644
--- a/schemas/student.py
+++ b/schemas/student.py
@@ -1,18 +1,40 @@
 from pydantic import BaseModel
 from datetime import date
+from pydantic import BaseModel, ConfigDict, Field, model_validator
 
 class StudentCreate(BaseModel):
-    student_no: str|None = None
-    student_name: str
-    class_id: int
-    consultant_id: int | None = None
-    native_place: str | None = None
-    graduate_school: str | None = None
-    major: str | None = None
+    student_no: str | None = Field(default=None, min_length=1, max_length=50)
+    student_name: str = Field(min_length=1, max_length=50)
+    class_id: int = Field(gt=0)
+    consultant_id: int | None = Field(default=None, gt=0)
+    native_place: str | None = Field(default=None, max_length=100)
+    graduation_school: str | None = Field(default=None, max_length=100)
+    major: str | None = Field(default=None, max_length=100)
     enrollment_date: date
     graduation_date: date | None = None
+    education: str | None = Field(default=None, max_length=50)
+    age: int = Field(ge=0, le=150)
+    gender: str = Field(min_length=1, max_length=10)
+
+    @model_validator(mode="after")
+    def check_dates(self):
+        # 3. 新增时两个日期都已确定，可以直接校验先后顺序。
+        if self.graduation_date and self.graduation_date < self.enrollment_date:
+            raise ValueError("毕业日期不能早于入学日期")
+        return self
+
+class StudentUpdate(BaseModel):
+    # 全部设为可选，前端只传需要修改的字段
+    student_no: str | None = None
+    student_name: str | None = None
+    class_id: int | None = None
+    consultant_id: int | None = None
+    native_place: str | None = None
+    graduation_school: str | None = None
+    major: str | None = None
+    enrollment_date: date | None = None
+    graduation_date: date | None = None
     education: str | None = None
-    age: int
-    gender: str
-
+    age: int | None = None
+    gender: str | None = None
 
diff --git a/utils/code_generator.py b/utils/code_generator.py
index 07b61d0..3320511 100644
--- a/utils/code_generator.py
+++ b/utils/code_generator.py
@@ -33,8 +33,8 @@ def add_student(
 '''
 
 
-
-def generate_no(field_name: str, prefix: str, db_object, db):
+from sqlalchemy.orm import Session
+def generate_no(field_name: str, prefix: str, db_object, db: Session):
     if getattr(db_object, field_name):             
         return