diff --git a/app/views/courses/_course_activity.html.erb b/app/views/courses/_course_activity.html.erb
index 1a033b372..e2e1dcfc2 100644
--- a/app/views/courses/_course_activity.html.erb
+++ b/app/views/courses/_course_activity.html.erb
@@ -73,6 +73,25 @@
 
             $(function () {
                 init_activity_KindEditor_data(<%= activity.id%>, null, "87%");
+                var description_images=$("div#activity_description_<%= activity.id %>").find("img");
+                if (description_images.length>0) {
+                    for (var i=0; i<description_images.length; i++){
+                        var image=$(description_images[i]);
+                        var element=$("<a></a>").attr("href",image.attr('src'));
+                        image.wrap(element);
+                    }
+                }
+                $('#activity_description_<%= activity.id %> a').colorbox({rel:'nofollow', close: "关闭", returnFocus: false});
+
+                var reply_images=$("div#reply_content_<%= activity.id %>").find("img");
+                if (reply_images.length>0) {
+                    for (var i=0; i<reply_images.length; i++){
+                        var image=$(reply_images[i]);
+                        var element=$("<a></a>").attr("href",image.attr('src'));
+                        image.wrap(element);
+                    }
+                }
+                $('#reply_content_<%= activity.id %> a').colorbox({rel:'nofollow', close: "关闭", returnFocus: false});
             });
         </script>
             <% if activity %>