diff --git a/app/views/layouts/base_forums.html.erb b/app/views/layouts/base_forums.html.erb
index a03a23e7f..c4ece5269 100644
--- a/app/views/layouts/base_forums.html.erb
+++ b/app/views/layouts/base_forums.html.erb
@@ -60,11 +60,15 @@
 
        function addTag(){
            if(<%=@forum.creator.id == User.current.id%>) {
-               if ($("input[name='addTag']").val().trim() != "") {
-                   $.get(
-                                   '<%= add_forum_tag_forum_path(@forum)%>' + "?tag_str=" + $("input[name='addTag']").val(),
-                           {}
-                   );
+               if ($("input[name='addTag']").val().trim() != ""   ) {
+                   if($("input[name='addTag']").val().trim().length <= 20) {
+                       $.get(
+                                       '<%= add_forum_tag_forum_path(@forum)%>' + "?tag_str=" + $("input[name='addTag']").val(),
+                               {}
+                       );
+                   }else{
+                       alert("标签名字长度不能超过20个字符");
+                   }
                }
            }
        }