diff --git a/PythonProject/api/cla_api.py b/PythonProject/api/cla_api.py
index f061525..d0e5109 100644
--- a/PythonProject/api/cla_api.py
+++ b/PythonProject/api/cla_api.py
@@ -3,7 +3,7 @@ from util.database import get_db
 from schema.cla_schema import claRequest
 from dao.cla_dao import add_class_dao,get_class_dao,update_class_dao,delete_class_dao
 
-claAPI = APIRouter(prefix="/class", tags=["班级管理"])
+claAPI = APIRouter(prefix="/class", tags=["班级管理模块"])
 
 @claAPI.post("/", summary="新增班级信息")
 def add_class(data: claRequest, Session = Depends(get_db)):
diff --git a/PythonProject/api/grade_api.py b/PythonProject/api/grade_api.py
index 6cbce56..f1988c8 100644
--- a/PythonProject/api/grade_api.py
+++ b/PythonProject/api/grade_api.py
@@ -5,7 +5,7 @@ from dao.grade_dao import *
 from schema.grade_schema import *
 from fastapi import APIRouter, Depends, HTTPException, Body
 
-gradeAPI = APIRouter(tags=['学生考核成绩'])
+gradeAPI = APIRouter(tags=['学生考核成绩管理模块'])
 
 @gradeAPI.get("/grade/{stu_id}",response_model=list[GradeResponse],summary="根据学生id查询成绩")
 def get_grade(stu_id: int,db=Depends(get_db)):
diff --git a/PythonProject/api/statistics_api.py b/PythonProject/api/statistics_api.py
index f82bdd3..bb256cc 100644
--- a/PythonProject/api/statistics_api.py
+++ b/PythonProject/api/statistics_api.py
@@ -35,7 +35,7 @@ def get_days(db=Depends(get_db)):
     l = select_avg_days(db)
     return l
 
-@StatisticsAPI.get('/emp',response_model=AllEmpResponse,summary='统计每个学生的就业时长')
+@StatisticsAPI.get('/emp',response_model=list[AllDayResponse],summary='统计每个学生的就业时长')
 def get_emp(db=Depends(get_db)):
     l= select_days(db)
     return l
diff --git a/PythonProject/api/student_api.py b/PythonProject/api/student_api.py
index 3ef4333..57676e7 100644
--- a/PythonProject/api/student_api.py
+++ b/PythonProject/api/student_api.py
@@ -4,7 +4,7 @@ from schema.student_schema import *
 from util.database import get_db
 
 
-StudentAPI = APIRouter(tags=['学⽣基本信息管理模块'])
+StudentAPI = APIRouter(tags=['学生基本信息管理模块'])
 
 @StudentAPI.get('/students',response_model=StudentPageResponse,summary='学生信息查询接口',description='查询学生信息')
 def get_students(stu_id:int|None=None
diff --git a/PythonProject/dao/statistics_dao.py b/PythonProject/dao/statistics_dao.py
index 0675ebc..c576206 100644
--- a/PythonProject/dao/statistics_dao.py
+++ b/PythonProject/dao/statistics_dao.py
@@ -124,18 +124,11 @@ def select_avg_days(db):
 #统计每个学⽣的就业时⻓
 def select_days(db):
     try:
-        l2 =db.query(
-                     Employment_info.stu_id
-                    ,Employment_info.employment_opening_date
-                    ,Employment_info.offer_issuance_date
-                       ,func.datediff(
-                                      Employment_info.offer_issuance_date
-                                     ,Employment_info.employment_opening_date
-                                     )
-                      .label("employment_duration_day")
-                    ).filter(
-                             Employment_info.delete_status == 0
-                             ).all()
+        l2 =db.query(Employment_info.stu_id
+                    ,func.coalesce(func.datediff(Employment_info.offer_issuance_date
+                                   ,Employment_info.employment_opening_date),0)\
+                     .label("diff_days")
+                     ).filter(Employment_info.delete_status == 0).all()
         return l2
     except Exception:
         raise HTTPException(status_code=500, detail="查询异常")
\ No newline at end of file
diff --git a/PythonProject/main.py b/PythonProject/main.py
index 3b07189..3474b17 100644
--- a/PythonProject/main.py
+++ b/PythonProject/main.py
@@ -5,7 +5,16 @@ from api.statistics_api import StatisticsAPI
 from api.teacher_api import teacher_api
 from api.grade_api import gradeAPI
 from api.cla_api import claAPI
-app = FastAPI(title='沃林学⽣管理系统')
+
+tags_metadata = [
+    {"name": "教师基本信息管理模块"},
+    {"name": "班级管理模块"},
+    {"name": "学生基本信息管理模块"},
+    {"name": "学生考核成绩管理模块"},
+    {"name": "学生就业管理模块"},
+    {"name": "统计分析模块"},
+]
+app = FastAPI(title='沃林学⽣管理系统',openapi_tags=tags_metadata)
 
 app.include_router(StudentAPI)
 
diff --git a/PythonProject/schema/statistics_schema.py b/PythonProject/schema/statistics_schema.py
index 028cd91..dbd532d 100644
--- a/PythonProject/schema/statistics_schema.py
+++ b/PythonProject/schema/statistics_schema.py
@@ -65,14 +65,9 @@ class AvgDayResponse(BaseModel):
     class_id: int
     avg_days: float | None
 
-class EmpItem(BaseModel):
+class AllDayResponse(BaseModel):
+    code:int = 200
+    detail:str = 'ok'
     stu_id: int
-    employment_opening_date:date | None
-    offer_issuance_date:date | None
-    employment_duration_day: int | None
-
-class AllEmpResponse(BaseModel):
-    code: int
-    msg: str
-    data: List[EmpItem]
+    diff_days: int | None