diff --git a/dao/student.py b/dao/student.py
index 021ad90..0030b49 100644
--- a/dao/student.py
+++ b/dao/student.py
@@ -22,3 +22,4 @@ def create_students(d: dict, db: Session):
         print(f"插入学生失败: {e}")
         return None
 
+# def updet_students():
\ No newline at end of file
diff --git a/models/student.py b/models/student.py
index 881c9b8..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)
-                        ,nullable = 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 6265446..213ae53 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
-    graduation_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 = None
-    age: int
-    gender: str
+    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):
+    # 1. 默认值为 None 是为了允许省略字段，不代表每个字段都能清空。
+    student_no: str | None = Field(default=None, min_length=1, max_length=50)
+    student_name: str | None = Field(default=None, min_length=1, max_length=50)
+    class_id: int | None = Field(default=None, 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 | None = None
+    graduation_date: date | None = None
+    education: str | None = Field(default=None, max_length=50)
+    age: int | None = Field(default=None, ge=0, le=150)
+    gender: str | None = Field(default=None, min_length=1, max_length=10)