diff --git a/res.py b/res.py
index bb93615e01b6512087ab1f86b1ba8fc55230212d..4f1799f49fb7dabf609779d2ac22fa6048c1c600 100644
--- a/res.py
+++ b/res.py
@@ -19,3 +19,6 @@ def checkPermission(cls,pms,stu): # 判断一个用户是否有权限管理该
 	# 教师、义管会、系统能管理所有学生
 	# 班级编号为6位：202001，学号为8位：20200100~20200199
 	return pms in [PMS_CLASS,PMS_TEACHER,PMS_SYSTEM] or(pms==PMS_CLASS and stu>=cls*100 and stu<cls*100+100)
+
+CURRENT_VERSION = "b99f9a5aff3fef173d46e270155b87fe"
+CURRENT_VERSION_ERROR_MESSAGE = "版本号过期，请重新下载"
diff --git a/user.py b/user.py
index c2fa11cf42138ff05fc7971ae519ce3847c10cee..9e8506b927d7bc18e3ccae651009a12cc974b373 100644
--- a/user.py
+++ b/user.py
@@ -2,6 +2,7 @@ from flask import Blueprint, request
 from deco import *
 import tokenlib as TK
 import json
+import res
 import traceback
 import oppressor as OP
 
@@ -12,6 +13,9 @@ User = Blueprint('user', __name__)
 def login_NoToken():
 	userid = json_data().get("userid")
 	password = json_data().get("password")
+	version = json_data().get("version")
+	if version != res.CURRENT_VERSION:
+                return {"type": "ERROR", "message": CURRENT_VERSION_ERROR_MESSAGE}
 	st, val = OP.userLogin(userid, password)
 	ret={}
 	if st:
@@ -24,6 +28,7 @@ def login_NoToken():
 			"permission": ret['permission']
 		})})
 	else:
+                ret.update({"type": "ERROR", "message": "用户名或密码错误"})
 		traceback.print_exc()
 		ret.update(val)
 	return ret