diff --git a/main.py b/main.py
index 1d00a40..cd5a45d 100644
--- a/main.py
+++ b/main.py
@@ -6,8 +6,6 @@ from contextlib import asynccontextmanager
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
-    print("Base from databases:", Base)
-    print("Tables:", Base.metadata.tables.keys())
     Base.metadata.create_all(engine1)
     yield
     engine1.dispose()
diff --git a/students/README_students.md b/students/README_students.md
new file mode 100644
index 0000000..94fc4b9
--- /dev/null
+++ b/students/README_students.md
@@ -0,0 +1,26 @@
+# students模块解释
+
+## main：学生管理系统的主程序文件、测试接口
+1. 下面所有配置文件的接口全部导入并建表
+2. 创建fastapi接口并本地运行
+
+## databases：链接数据库配置文件
+1. 链接本地mysql，实例化mysql，创建引擎，创建基类，实例化数据库会话
+2. 创建函数，调用数据库会话
+
+## api.students_api：接口文件
+1. 
+
+
+## dao.students_dao：数据筛选文件
+1. 
+
+
+## model.students_model：数据库建表文件
+1. 
+
+
+## schema.students_request：请求体、数据过滤
+1. 
+
+
diff --git a/students/api/students_api.py b/students/api/students_api.py
index ffc29ed..d57a617 100644
--- a/students/api/students_api.py
+++ b/students/api/students_api.py
@@ -51,13 +51,11 @@ def get_students( stu:StudentsUpdate = Depends()
 
 @students_api.delete("/students"
     ,summary='删除学生资料'
-    ,description='输入需要删除的学生信息，工资筛选能删除大于等于输入工资的所有人。'
+    ,description='输入需要删除的学生信息，删除条件任选，但不可全为空，工资筛选能删除大于等于输入工资的所有人。'
     ,response_model=list[StudentsDelete] ) # 逻辑删除/软删除
 def delete_students( stu:StudentsDelete = Depends()
                     , db=Depends(get_db)
                     ):
     s_dict = stu.model_dump(exclude_unset=True)
-    result = add_student_dao(s=s_dict, db=db)
-    if not result:
-        raise HTTPException(status_code=500, detail='手机号已有学生使用。')
-    return result
\ No newline at end of file
+    result = delete_student_dao(s=s_dict, db=db)
+    return result
diff --git a/students/dao/students_dao.py b/students/dao/students_dao.py
index 97d9e38..117c70c 100644
--- a/students/dao/students_dao.py
+++ b/students/dao/students_dao.py
@@ -112,33 +112,45 @@ def update_student_dao( s , db):
 # 逻辑删除/软删除
 def delete_student_dao( s , db):
     try:
+        if not any([s.get('sid')
+                       ,s.get("student_name")
+                       ,s.get("student_phone")
+                       ,s.get("class_name")
+                       ,s.get("job_open_time")
+                       ,s.get("offer_issue_time")
+                       ,s.get("company_name")
+                       ,s.get("salary")
+                    ]):
+            raise HTTPException(status_code=400, detail="输入需要删除的学生信息，删除条件任选，但不可全为空。")
         q = db.query(Students).filter(Students.is_deleted == False)
         if s.get('sid'):
-            q = q.filter(Students.sid == s.sid)
+            q = q.filter(Students.sid == s.get("sid") )
         if s.get('student_name'):
-            q = q.filter(Students.student_name == s.student_name)
+            q = q.filter(Students.student_name == s.get("student_name") )
         if s.get("student_phone"):
-            q = q.filter(Students.student_phone == s.student_phone)
+            q = q.filter(Students.student_phone == s.get("student_phone") )
         if s.get('class_name'):
-            q = q.filter(Students.class_name == s.class_name)
+            q = q.filter(Students.class_name == s.get("class_name") )
         if s.get('job_open_time'):
-            q = q.filter(Students.job_open_time == s.job_open_time)
+            q = q.filter(Students.job_open_time == s.get("job_open_time") )
         if s.get('offer_issue_time'):
-            q = q.filter(Students.offer_issue_time == s.offer_issue_time)
+            q = q.filter(Students.offer_issue_time == s.get("offer_issue_time") )
         if s.get('company_name'):
-            q = q.filter(Students.company_name == s.company_name)
+            q = q.filter(Students.company_name == s.get("company_name") )
         if s.get('salary'):
-            q = q.filter(Students.salary >= s.salary)
+            q = q.filter(Students.salary >= s.get("salary") )
         s1_delete = q.all()
         if not s1_delete:
-            raise HTTPException(status_code=404, detail="Student not found")
+            raise HTTPException(status_code=404, detail="没有找到该学生。")
         for i in s1_delete:
             i.is_deleted = True
             i.deleted_date = datetime.now()
-        s2_deleted =[{"删除的学生ID":i.sid,"删除的学生姓名":i.student_name,"删除的学生电话":i.student_phone}for i in s1_delete]
+        s2_deleted =[{"sid":i.sid,"student_name":i.student_name,"student_phone":i.student_phone}for i in s1_delete]
+    except HTTPException:
+        raise
     except Exception:
         db.rollback()
-        return False
+        raise HTTPException(status_code=500, detail="Internal server error")
     else:
         db.commit()
         return s2_deleted
diff --git a/students/model/students_model.py b/students/model/students_model.py
index 7110361..90275a6 100644
--- a/students/model/students_model.py
+++ b/students/model/students_model.py
@@ -3,7 +3,7 @@ import datetime
 
 from students.databases import *
 from datetime import datetime
-
+from sqlalchemy.dialects.mysql import DATETIME
 
 class Students(Base):
     __tablename__ = 'students'
@@ -27,11 +27,11 @@ class Students(Base):
 
     salary = Column(Integer , comment='就业薪资')
 
-    create_date = Column(DATETIME , default=datetime.now , comment='创建时间' )
+    create_date = Column(DATETIME(fsp=3) , default=datetime.now , comment='创建时间' )
 
-    update_date = Column(DATETIME , default=datetime.now , comment='更新时间' )
+    update_date = Column(DATETIME(fsp=3) , default=datetime.now , comment='更新时间' )
 
     is_deleted = Column(INTEGER , default=False , comment='是否删除：0-正常，1-已删除' )
 
-    deleted_date = Column(DATETIME , default=datetime.now , comment='删除时间' )
+    deleted_date = Column(DATETIME(fsp=3) , default=None , comment='删除时间'  )