diff --git a/account/models.py b/account/models.py
index a724f5a..df25329 100644
--- a/account/models.py
+++ b/account/models.py
@@ -14,6 +14,11 @@ class UserManager(models.Manager):
         return self.get(**{self.model.USERNAME_FIELD: username})
 
 
+REGULAR_USER = 0
+ADMIN = 1
+SUPER_ADMIN = 2
+
+
 class User(AbstractBaseUser):
     # 用户名
     username = models.CharField(max_length=30, unique=True)
diff --git a/oj/settings.py b/oj/settings.py
index 910914c..c8a07ec 100644
--- a/oj/settings.py
+++ b/oj/settings.py
@@ -49,6 +49,7 @@ INSTALLED_APPS = (
     'account',
     'announcement',
     'utils',
+    'group',
 
     'rest_framework',
     'rest_framework_swagger',
@@ -63,6 +64,7 @@ MIDDLEWARE_CLASSES = (
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
     'django.middleware.security.SecurityMiddleware',
+    'admin.middleware.AdminRequiredMiddleware'
 )
 
 ROOT_URLCONF = 'oj.urls'
diff --git a/oj/urls.py b/oj/urls.py
index a69c8ee..b2eecb9 100644
--- a/oj/urls.py
+++ b/oj/urls.py
@@ -3,9 +3,11 @@ from django.conf.urls import include, url
 from django.contrib import admin
 from django.views.generic import TemplateView
 
-from account.views import UserLoginAPIView, UsernameCheckAPIView, UserRegisterAPIView, UserChangePasswordAPIView, \
-    EmailCheckAPIView, UserAPIView, UserAdminAPIView
+from account.views import (UserLoginAPIView, UsernameCheckAPIView, UserRegisterAPIView,
+                           UserChangePasswordAPIView, EmailCheckAPIView,
+                           UserAPIView, UserAdminAPIView)
 from announcement.views import AnnouncementAPIView, AnnouncementAdminAPIView
+from group.views import GroupAdminAPIView
 from admin.views import AdminTemplateView
 
 urlpatterns = [
@@ -29,5 +31,6 @@ urlpatterns = [
 
     url(r'^admin/contest/$', TemplateView.as_view(template_name="admin/contest/add_contest.html"), name="add_contest_page"),
     url(r'^problems/$', TemplateView.as_view(template_name="oj/problem/problem_list.html"), name="problem_list_page"),
-    url(r'^admin/template/(?P<template_dir>\w+)/(?P<template_name>\w+).html', AdminTemplateView.as_view(), name="admin_template")
+    url(r'^admin/template/(?P<template_dir>\w+)/(?P<template_name>\w+).html', AdminTemplateView.as_view(), name="admin_template"),
+    url(r'^api/admin/group/$', GroupAdminAPIView.as_view(), name="group_admin_api"),
 ]