diff --git a/media/css/seahub.css b/media/css/seahub.css
index 9f922b31b4..90d5b5b93e 100644
--- a/media/css/seahub.css
+++ b/media/css/seahub.css
@@ -1831,6 +1831,11 @@ textarea:-moz-placeholder {/* for FF */
 #wiki-content h2 {
     border-bottom: 1px solid #ccc;
 }
+.wiki-image {
+    display: block;
+    margin-left: auto;
+    margin-right: auto;     
+}
 #svg-view {
     min-height:500px;/*for ff*/
 }
diff --git a/views/file.py b/views/file.py
index e378f20551..cbc617128e 100644
--- a/views/file.py
+++ b/views/file.py
@@ -240,7 +240,7 @@ def convert_md_link(file_content, repo_id, username):
                 return '''<p class="wiki-page-missing">%s</p>''' %  linkname
 
             token = web_get_access_token(repo_id, obj_id, 'view', username)
-            return '<img src="%s" alt="%s" />' % (gen_file_get_url(token, filename), filename)
+            return '<img class="wiki-image" src="%s" alt="%s" />' % (gen_file_get_url(token, filename), filename)
         else:
             from base.templatetags.seahub_tags import file_icon_filter
             
diff --git a/wiki/utils.py b/wiki/utils.py
index c0ca9874e5..fcdc465f70 100644
--- a/wiki/utils.py
+++ b/wiki/utils.py
@@ -144,7 +144,7 @@ def convert_wiki_link(content, url_prefix, repo_id, username):
                     (url_prefix + '/' + page_name.replace('/', '-'), page_name)
 
             token = seaserv.web_get_access_token(repo_id, obj_id, 'view', username)
-            ret = '<img src="%s" alt="%s" />' % (gen_file_get_url(token, filename), filename)
+            ret = '<img class="wiki-image" src="%s" alt="%s" />' % (gen_file_get_url(token, filename), filename)
             return smart_str(ret)
         else:
             from base.templatetags.seahub_tags import file_icon_filter