diff --git a/media/css/seahub.css b/media/css/seahub.css
index 31f9c9021f..af00a00ed4 100644
--- a/media/css/seahub.css
+++ b/media/css/seahub.css
@@ -316,6 +316,12 @@ p { margin:0.5em 0; }
 .alc { text-align: center;}
 .cspt { cursor:pointer; }
 .pos-rel { position:relative; }
+.top-tip {
+    background:#fddaa4;
+    color:#1f0600;
+    text-align:center;
+    margin:0 0 15px;
+}
 /** for input, textarea in form **/ /* e.g repo-create */
 .input, .textarea {
     width:260px;
diff --git a/seahub/templates/sysadmin/sys_useradmin.html b/seahub/templates/sysadmin/sys_useradmin.html
index c5bafce2e9..b307170eda 100644
--- a/seahub/templates/sysadmin/sys_useradmin.html
+++ b/seahub/templates/sysadmin/sys_useradmin.html
@@ -81,10 +81,33 @@ $(function(){
             if (data['need_update']) {
                 var tip = "{% trans "A new server version %(v)s is available." %}";
                 tip = tip.replace('%(v)s', data['new_version']);
-                $('#title-panel').html('<p class="alc" style="background:#fddaa4;color:#1f0600;padding:3px 0;margin:0 0 15px;">' + tip + '</p>').removeClass('hide');
+                $('#title-panel').append('<p>' + tip + '</p>').addClass('top-tip').removeClass('hide');
             }
         }
     });
+
+    {% if is_pro %}
+    // check if seafile license expired
+    $.ajax({
+        url: "{% url 'sys_check_license' %}",
+        dataType: 'json',
+        cache: false,
+        success: function(data) {
+            var tip;
+
+            if (data['already_expired']) {
+                tip = "Your license expired on %(date)s.";
+            } else if (data['to_be_expired']) {
+                tip = "Your license will expire on %(date)s.";
+            }
+
+            if (data['already_expired'] || data['to_be_expired']) {
+                tip = tip.replace('%(date)s', data['expiration_date']);
+                $('#title-panel').append('<p>' + tip + '</p>').addClass('top-tip').removeClass('hide');
+            }
+        }
+    });
+    {% endif %}
 });
 
 $('#add-user-btn').click(function() {
diff --git a/seahub/urls.py b/seahub/urls.py
index 4bf67f4bd4..6be848f71f 100644
--- a/seahub/urls.py
+++ b/seahub/urls.py
@@ -236,6 +236,7 @@ urlpatterns = patterns(
     url(r'^sys/uploadlink/remove/$', sys_upload_link_remove, name='sys_upload_link_remove'),
     url(r'^sys/notificationadmin/', notification_list, name='notification_list'),
     url(r'^sys/sudo/', sys_sudo_mode, name='sys_sudo_mode'),
+    url(r'^sys/check-license/', sys_check_license, name='sys_check_license'),
     url(r'^useradmin/add/$', user_add, name="user_add"),
     url(r'^useradmin/remove/(?P<email>[^/]+)/$', user_remove, name="user_remove"),
     url(r'^useradmin/removetrial/(?P<user_or_org>[^/]+)/$', remove_trial, name="remove_trial"),
diff --git a/seahub/views/sysadmin.py b/seahub/views/sysadmin.py
index 0853760ddd..3f082a4758 100644
--- a/seahub/views/sysadmin.py
+++ b/seahub/views/sysadmin.py
@@ -8,6 +8,7 @@ import re
 import datetime
 import stat
 import csv, chardet, StringIO
+import time
 from constance import config
 
 from django.core.urlresolvers import reverse
@@ -2041,3 +2042,38 @@ def sys_settings(request):
     return render_to_response('sysadmin/settings.html', {
         'config_dict': config_dict,
     }, context_instance=RequestContext(request))
+
+@login_required_ajax
+@sys_staff_required
+def sys_check_license(request):
+    """Check seafile license expiration.
+    """
+    if not is_pro_version():
+        raise Http404
+
+    content_type = 'application/json; charset=utf-8'
+    result = {}
+
+    license_file = os.path.join(settings.PROJECT_ROOT, '../../seafile-license.txt')
+    license_dict = parse_license(license_file)
+    if license_dict:
+        try:
+            expiration = license_dict['Expiration']
+        except KeyError as e:
+            logger.error(e)
+            result['error'] = str(e)
+            return HttpResponse(json.dumps(result), status=500, content_type=content_type)
+
+        struct_time = datetime.datetime.strptime(expiration, "%Y-%m-%d")
+        expiration_timestamp = time.mktime(struct_time.timetuple())
+
+        if time.time() > expiration_timestamp:
+            # already expired
+            result['already_expired'] = True
+        elif time.time() + 30 * 24 * 60 * 60 > expiration_timestamp:
+            # will be expired in 30 days
+            result['to_be_expired'] = True
+
+        result['expiration_date'] = expiration
+
+    return HttpResponse(json.dumps(result), content_type=content_type)