diff --git a/seahub/notifications/models.py b/seahub/notifications/models.py
index 692dadd6ba..a1e67688f9 100644
--- a/seahub/notifications/models.py
+++ b/seahub/notifications/models.py
@@ -56,7 +56,8 @@ def priv_file_share_msg_to_json(share_from, file_name, priv_share_token):
                        'priv_share_token': priv_share_token})
 
 def group_msg_to_json(group_id, msg_from, message):
-    return json.dumps({'group_id': group_id, 'msg_from': msg_from, 'message': message})
+    return json.dumps({'group_id': group_id, 'msg_from': msg_from,
+                       'message': message})
 
 def grpmsg_reply_to_json(msg_id, reply_from, reply_msg):
     return json.dumps({'msg_id': msg_id, 'reply_from': reply_from, 'reply_msg': reply_msg})
@@ -158,7 +159,7 @@ class UserNotificationManager(models.Manager):
                         notice.save()
             except UserNotification.InvalidDetailError:
                 continue
-                
+
     def seen_group_msg_reply_notice(self, to_user, msg_id=None):
         """Mark all group message replies of a user as seen.
 
@@ -187,14 +188,11 @@ class UserNotificationManager(models.Manager):
         user_notices = super(UserNotificationManager, self).filter(
             to_user=to_user, seen=False, msg_type=MSG_TYPE_USER_MESSAGE)
         for notice in user_notices:
-            try:
-                notice_from_user = notice.user_message_detail_to_dict().get('msg_from')
-                if from_user == notice_from_user:
-                    if notice.seen is False:
-                        notice.seen = True
-                        notice.save()
-            except UserNotification.InvalidDetailError:
-                continue
+            notice_from_user = notice.user_message_detail_to_dict().get('msg_from')
+            if from_user == notice_from_user:
+                if notice.seen is False:
+                    notice.seen = True
+                    notice.save()
 
     def remove_group_msg_notices(self, to_user, group_id):
         """Remove group message notices of a user.
@@ -456,7 +454,6 @@ class UserNotification(models.Model):
         Arguments:
         - `self`:
 
-        Raises ``InvalidDetailError`` if detail field can not be parsed.
         """
         assert self.is_user_message()
 
@@ -571,11 +568,8 @@ class UserNotification(models.Model):
             return _(u"Internal error")
 
         message = d.get('message')
-        if message:
-            msg = _(u"<br>%(message)s") % {
-                'message': message,
-                }
-            return msg
+        if message is not None:
+            return message
         else:
             return None
 
@@ -621,11 +615,8 @@ class UserNotification(models.Model):
             return _(u"Internal error")
 
         message = d.get('message')
-
-        if message:
-            msg = _(u"<br>%(message)s") % {
-                'message': message}
-            return msg
+        if message is not None:
+            return message
         else:
             return None
 
@@ -665,11 +656,8 @@ class UserNotification(models.Model):
             return _(u"Internal error")
 
         reply_msg = d.get('reply_msg')
-
-        if reply_msg:
-            msg = _(u"<br>%(reply_msg)s") % {
-                'reply_msg': reply_msg}
-            return msg
+        if reply_msg is not None:
+            return reply_msg
         else:
             return None
 
@@ -772,7 +760,7 @@ def grpmsg_added_cb(sender, **kwargs):
     message = kwargs['message']
     group_members = seaserv.get_group_members(int(group_id))
 
-    notify_members = [ x.user_name for x in group_members if x.user_name != from_email ]
+    notify_members = [x.user_name for x in group_members if x.user_name != from_email]
 
     detail = group_msg_to_json(group_id, from_email, message)
     UserNotification.objects.bulk_add_group_msg_notices(notify_members, detail)
diff --git a/seahub/notifications/templates/notifications/notice_email.html b/seahub/notifications/templates/notifications/notice_email.html
index 1ec3c7b684..b9052ed022 100644
--- a/seahub/notifications/templates/notifications/notice_email.html
+++ b/seahub/notifications/templates/notifications/notice_email.html
@@ -5,7 +5,7 @@
 {% block email_con %}
 {% autoescape off %}
 
-<p style="color:#121214;font-size:14px;">Hi, {% blocktrans with name=to_user|email2nickname %}{{ name }}{% endblocktrans %}</p>
+<p style="color:#121214;font-size:14px;">Hi, {{ name|email2nickname }}</p>
 
 <p style="font-size:14px;color:#434144;">
 {% blocktrans count num=notice_count %}
diff --git a/seahub/templates/snippets/notifications_popup.html b/seahub/templates/snippets/notifications_popup.html
index 828ff66b42..6c1635b3a4 100644
--- a/seahub/templates/snippets/notifications_popup.html
+++ b/seahub/templates/snippets/notifications_popup.html
@@ -18,15 +18,15 @@
 
             {% if notice.is_group_msg %}
                 <p class="brief">{{ notice.format_group_message_title|safe }}
-                {% if notice.format_group_message_detail %}
-                {{ notice.format_group_message_detail|safe }}
+                {% if notice.format_group_message_detail %}<br>
+                {{ notice.format_group_message_detail }}
                 {% endif %}
                 </p>
 
             {% elif notice.is_grpmsg_reply %}
                 <p class="brief">{{ notice.format_grpmsg_reply_title|safe }}
-                {% if notice.format_grpmsg_reply_detail %}
-                {{ notice.format_grpmsg_reply_detail|safe }}
+                {% if notice.format_grpmsg_reply_detail %}<br>
+                {{ notice.format_grpmsg_reply_detail}}
                 {% endif %}
                 </p>
 
@@ -41,8 +41,8 @@
 
             {% elif notice.is_user_message %}
                 <p class="brief">{{ notice.format_user_message_title|safe }}
-                {% if notice.format_user_message_detail %}
-                {{ notice.format_user_message_detail|safe }}
+                {% if notice.format_user_message_detail %}<br>
+                {{ notice.format_user_message_detail }}
                 {% endif %}
                 </p>
 
diff --git a/seahub/views/ajax.py b/seahub/views/ajax.py
index 266e907c93..04ab604b65 100644
--- a/seahub/views/ajax.py
+++ b/seahub/views/ajax.py
@@ -39,7 +39,6 @@ from seahub.utils import check_filename_with_rename, EMPTY_SHA1, \
     get_repo_last_modify, gen_file_upload_url, is_org_context, \
     get_org_user_events, get_user_events
 from seahub.utils.star import star_file, unstar_file
-from seahub.avatar.util import get_default_avatar_url
 
 # Get an instance of a logger
 logger = logging.getLogger(__name__)
@@ -1276,7 +1275,12 @@ def unseen_notices_count(request):
 
 @login_required
 def get_popup_notices(request):
-    """Get user's unseen notices:
+    """Get user's notifications.
+
+    If unseen notices > 5, return all unseen notices.
+    If unseen notices = 0, return last 5 notices.
+    Otherwise return all unseen notices, pluse some seen notices to make the
+    sum equal to 5.
 
     Arguments:
     - `request`:
@@ -1287,21 +1291,23 @@ def get_popup_notices(request):
     content_type = 'application/json; charset=utf-8'
     username = request.user.username
 
-    count = UserNotification.objects.count_unseen_user_notifications(username)
     result_notices = []
     unseen_notices = []
     seen_notices = []
-    list_num = 5
 
+    list_num = 5
+    count = UserNotification.objects.count_unseen_user_notifications(username)
     if count == 0:
-        seen_notices = UserNotification.objects.filter(to_user = username)[:list_num]
+        seen_notices = UserNotification.objects.get_user_notifications(
+            username)[:list_num]
     elif count > list_num:
-        unseen_notices = UserNotification.objects.filter(to_user = username, seen = False)
+        unseen_notices = UserNotification.objects.get_user_notifications(
+            username, seen=False)
     else:
-        unseen_notices = UserNotification.objects.filter(to_user = username, seen = False)
-        seen_notices = UserNotification.objects.filter(
-                                        to_user = username,
-                                        seen = True)[:list_num-count]
+        unseen_notices = UserNotification.objects.get_user_notifications(
+            username, seen=False)
+        seen_notices = UserNotification.objects.get_user_notifications(
+            username, seen=True)[:list_num - count]
 
     result_notices += unseen_notices
     result_notices += seen_notices
@@ -1310,49 +1316,42 @@ def get_popup_notices(request):
         if notice.is_user_message():
             d = notice.user_message_detail_to_dict()
             notice.msg_from = d.get('msg_from')
-            continue
 
         elif notice.is_group_msg():
-            d = json.loads(notice.detail)
-            notice.msg_from = d['msg_from']
-            continue
+            d = notice.group_message_detail_to_dict()
+            notice.msg_from = d.get('msg_from')
 
         elif notice.is_grpmsg_reply():
-            d = json.loads(notice.detail)
-            notice.msg_from = d['reply_from']
-            continue
+            d = notice.grpmsg_reply_detail_to_dict()
+            notice.msg_from = d.get('reply_from')
 
         elif notice.is_file_uploaded_msg():
-            d = json.loads(notice.detail)
+            from seahub.avatar.util import get_default_avatar_url
             notice.default_avatar_url = get_default_avatar_url()
-            continue
 
         elif notice.is_repo_share_msg():
             d = json.loads(notice.detail)
             notice.msg_from = d['share_from']
-            continue
 
         elif notice.is_priv_file_share_msg():
             d = json.loads(notice.detail)
             notice.msg_from = d['share_from']
-            continue
 
         elif notice.is_group_join_request():
             d = json.loads(notice.detail)
             notice.msg_from = d['username']
-            continue
 
         else:
             pass
 
     ctx_notices = {"notices": result_notices}
-
     notifications_popup_html = render_to_string(
             'snippets/notifications_popup.html', ctx_notices,
             context_instance=RequestContext(request))
 
-    return HttpResponse(json.dumps({"notifications_popup_html": notifications_popup_html}),
-                        content_type=content_type)
+    return HttpResponse(json.dumps({
+                "notifications_popup_html": notifications_popup_html,
+                }), content_type=content_type)
 
 @login_required
 def set_notices_seen(request):
@@ -1367,7 +1366,8 @@ def set_notices_seen(request):
     content_type = 'application/json; charset=utf-8'
     username = request.user.username
 
-    unseen_notices = UserNotification.objects.filter(to_user = username, seen = False)
+    unseen_notices = UserNotification.objects.get_user_notifications(username,
+                                                                     seen=False)
     for notice in unseen_notices:
         notice.seen = True
         notice.save()