diff --git a/class_management/dao/class_management_dao.py b/class_management/dao/class_management_dao.py
index 7b4450b..4df3f09 100644
--- a/class_management/dao/class_management_dao.py
+++ b/class_management/dao/class_management_dao.py
@@ -4,6 +4,12 @@ from sqlalchemy.orm import Session
 #新增班级
 def add_class_dao(c,db):
     try:
+        exist_class = db.query(ClassInfo).filter(
+            ClassInfo.num == c["num"],
+            ClassInfo.is_delete == 0
+        ).first()
+        if exist_class:
+            return False
         c1 = ClassInfo(**c)
         db.add(c1)
     except:
@@ -11,6 +17,7 @@ def add_class_dao(c,db):
         return False
     else:
         db.commit()
+        db.refresh(c1)
         return True
 
 
diff --git a/class_management/model/class_management_model.py b/class_management/model/class_management_model.py
index af66fa6..fb6c2aa 100644
--- a/class_management/model/class_management_model.py
+++ b/class_management/model/class_management_model.py
@@ -22,16 +22,16 @@ class ClassInfo(Base_all):
                         ,comment='班级名称'
                         )
     head_teacher_id = Column(Integer
-                            ,ForeignKey('teacher.id')
+                            ,ForeignKey('teachers.id')
                             ,comment='班主任编号'
                             )
 
     coach_teacher_id = Column(Integer
-                              ,ForeignKey('teacher.id')
+                              ,ForeignKey('teachers.id')
                               ,comment='授课老师编号'
                               )
     tutor_teacher_id = Column(Integer
-                              ,ForeignKey('teacher.id')
+                              ,ForeignKey('teachers.id')
                               ,comment='助教老师编号'
                               )
     class_start_time = Column(Date