diff --git a/app/controllers/oauth_controller.rb b/app/controllers/oauth_controller.rb
index 16f83291..4dd2e6fd 100644
--- a/app/controllers/oauth_controller.rb
+++ b/app/controllers/oauth_controller.rb
@@ -188,14 +188,13 @@ class OauthController < ApplicationController
         break if existing_user.present?
 
         user = User.new(lastname: name, mail: email, mail_notification: email)
-        user.login = custom_openi_login(login)
+        user.login = generate_login('m')
         user.password = DEFAULT_PASSWORD
+        user.certification = 1
         user.save!
 
         UserExtensions.create!(user_id: user.id, school_id: School.first.id, identity: 4, gender: 0)
 
-        UserDayCertification.create!(user_id: user.id, status: 1)
-
         openi = Openi.create!(user_id: user.id, openi_user_id: openi_user_id, avatar_url: avatar_url, login: login, name: name, email: email)
       end
     end
@@ -214,9 +213,10 @@ class OauthController < ApplicationController
   ####--End-- 获取Openi的授权码，access_token，以及用户信息。为在openi登录的用户创建相关的educoder用户 ####
 
   private
-  # 为了保证新创建的用户用户名不与系统中已存在的用户冲突，加上 _openi 后缀
-  def custom_openi_login(login)
-    login + '_openi'
+  # 为新创建的用户随机生成以m为前缀的用户名，m表示该用户是用邮箱注册
+  def generate_login(login_pre)
+    us = UsersService.new
+    us.generate_user_login(login_pre)
   end
 
   def require_login