diff --git a/students/dao/students_dao.py b/students/dao/students_dao.py
index 529d58e..74fe731 100644
--- a/students/dao/students_dao.py
+++ b/students/dao/students_dao.py
@@ -67,12 +67,15 @@ def add_student_dao( s , db):
             raise ValueError("手机号不能为空")
         if not s.get("class_id") or not s.get("advisor_id"):
             raise ValueError("班级ID和顾问ID不能为空")
-        s1_class_id = db.query(Students).filter(Students.phone == phone).first()
-        s1_advisor_id = db.query(Students).filter(Students.phone == phone).first()
+        # 查询 classes 表确认 class_id 存在
+        from Teachers.model.tea_model import Tea
+        s1_class_id = db.query(Tea).filter(Tea.id == s.get("class_id")).first()
+        # 查询 teachers 表确认 advisor_id 存在
+        s1_advisor_id = db.query(Tea).filter(Tea.id == s.get("advisor_id")).first()
         if not s1_class_id:
-            raise ValueError(f"班级ID {s.get("class_id")} 不存在，请先创建班级")
+            raise ValueError(f"班级ID {s.get('class_id')} 不存在，请先创建班级")
         if not s1_advisor_id:
-            raise ValueError(f"顾问ID {s.get("advisor_id")} 不存在，请先创建顾问")
+            raise ValueError(f"顾问ID {s.get('advisor_id')} 不存在，请先创建顾问")
         if s1_deleted and s1_deleted.is_deleted == True:
             s1_deleted.name = s.get("name")
             s1_deleted.age = s.get("age")
@@ -96,7 +99,11 @@ def add_student_dao( s , db):
             db.commit()
             db.refresh(s1_deleted)  # 从数据库再拉一次数据
             return s1_deleted
-        s1 = Students( **s )
+        s1 = Students(**s)
+        # 显式设置时间，避免 SQLAlchemy 字典构建时跳过 default
+        now = datetime.now()
+        s1.create_date = now
+        s1.update_date = now
         db.add(s1)
         db.commit()
     except ValueError as e: