diff --git a/DjangoBlog/blog_signals.py b/DjangoBlog/blog_signals.py
index 7133a83..e4de51c 100644
--- a/DjangoBlog/blog_signals.py
+++ b/DjangoBlog/blog_signals.py
@@ -22,7 +22,7 @@ from django.core.mail import EmailMultiAlternatives
 from django.db.models.signals import post_save
 from django.contrib.auth.signals import user_logged_in, user_logged_out, user_login_failed
 
-from DjangoBlog.utils import cache, send_email, expire_view_cache, get_blog_setting
+from DjangoBlog.utils import cache, send_email, expire_view_cache, get_blog_setting, delete_view_cache
 from DjangoBlog.spider_notify import SpiderNotify
 from oauth.models import OAuthUser
 from blog.models import Article, Category, Tag, Links, SideBar, BlogSettings
@@ -65,12 +65,16 @@ def send_email_signal_handler(sender, **kwargs):
 def oauth_user_login_signal_handler(sender, **kwargs):
     id = kwargs['id']
     oauthuser = OAuthUser.objects.get(id=id)
-    setting = get_blog_setting()
-    if oauthuser.picture and not oauthuser.picture.startswith(setting.resource_path):
+    site = Site.objects.get_current().domain
+    if oauthuser.picture and not oauthuser.picture.find(site) >= 0:
         from DjangoBlog.utils import save_user_avatar
         oauthuser.picture = save_user_avatar(oauthuser.picture)
         oauthuser.save()
 
+    delete_view_cache(oauthuser.author.username)
+
+    cache.clear()
+
 
 @receiver(post_save)
 def model_post_save_callback(sender, instance, created, raw, using, update_fields, **kwargs):
@@ -99,10 +103,7 @@ def model_post_save_callback(sender, instance, created, raw, using, update_field
             cache.delete('seo_processor')
         comment_cache_key = 'article_comments_{id}'.format(id=instance.article.id)
         cache.delete(comment_cache_key)
-        from django.core.cache.utils import make_template_fragment_key
-        key = make_template_fragment_key('sidebar', [instance.author.username])
-        logger.info('delete sidebar key:' + key)
-        cache.delete(key)
+        delete_view_cache(instance.author.username)
 
         _thread.start_new(send_comment_email, (instance,))
 
@@ -114,4 +115,5 @@ def model_post_save_callback(sender, instance, created, raw, using, update_field
 @receiver(user_logged_out)
 def user_auth_callback(sender, request, user, **kwargs):
     logger.info(user)
+    delete_view_cache(user.username)
     cache.clear()
diff --git a/DjangoBlog/utils.py b/DjangoBlog/utils.py
index 8b9167b..0a4fcf4 100644
--- a/DjangoBlog/utils.py
+++ b/DjangoBlog/utils.py
@@ -209,11 +209,19 @@ def get_blog_setting():
 
 
 def save_user_avatar(url):
+    setting = get_blog_setting()
+    logger.info(url)
+    try:
+        imgname = url.split('/')[-1]
+        if imgname:
+            path = r'{basedir}/avatar/{img}'.format(basedir=setting.resource_path, img=imgname)
+            if os.path.exists(path):
+                os.remove(path)
+    except:
+        pass
     try:
         rsp = requests.get(url, timeout=2)
         if rsp.status_code == 200:
-            setting = get_blog_setting()
-
             basepath = r'{basedir}/avatar/'.format(basedir=setting.resource_path)
             if not os.path.exists(basepath):
                 os.makedirs(basepath)
@@ -229,3 +237,10 @@ def save_user_avatar(url):
     except Exception as e:
         logger.error(e)
         return url
+
+
+def delete_view_cache(username):
+    from django.core.cache.utils import make_template_fragment_key
+    key = make_template_fragment_key('sidebar', [username])
+    logger.info('delete sidebar key:' + key)
+    cache.delete(key)
diff --git a/accounts/tests.py b/accounts/tests.py
index 1330bdf..29fe028 100644
--- a/accounts/tests.py
+++ b/accounts/tests.py
@@ -5,6 +5,7 @@ from django.contrib.sites.models import Site
 import datetime
 from accounts.models import BlogUser
 from django.urls import reverse
+from DjangoBlog.utils import *
 
 
 # Create your tests here.
@@ -58,6 +59,7 @@ class AccountTest(TestCase):
         user.is_superuser = True
         user.is_staff = True
         user.save()
+        delete_view_cache(user.username)
         category = Category()
         category.name = "categoryaaa"
         category.created_time = datetime.datetime.now()
diff --git a/oauth/admin.py b/oauth/admin.py
index ddeff0c..f778918 100644
--- a/oauth/admin.py
+++ b/oauth/admin.py
@@ -24,9 +24,6 @@ class OAuthUserAdmin(admin.ModelAdmin):
     def has_add_permission(self, request):
         return False
 
-    def has_delete_permission(self, request, obj=None):
-        return False
-
     def link_to_usermodel(self, obj):
         if obj.author:
             info = (obj.author._meta.app_label, obj.author._meta.model_name)
diff --git a/oauth/views.py b/oauth/views.py
index c399255..6be50a3 100644
--- a/oauth/views.py
+++ b/oauth/views.py
@@ -58,7 +58,11 @@ def authorize(request):
             import datetime
             user.nikename = "djangoblog" + datetime.datetime.now().strftime('%y%m%d%I%M%S')
         try:
-            user = OAuthUser.objects.get(type=type, openid=user.openid)
+            temp = OAuthUser.objects.get(type=type, openid=user.openid)
+            temp.picture = user.picture
+            temp.matedata = user.matedata
+            temp.nikename = user.nikename
+            user = temp
         except ObjectDoesNotExist:
             pass
         # facebook的token过长
@@ -83,7 +87,6 @@ def authorize(request):
 
             oauth_user_login_signal.send(sender=authorize.__class__, id=user.id)
             login(request, author)
-
             return HttpResponseRedirect(nexturl)
         if not email:
             user.save()