diff --git a/app/views/forums/show.html.erb b/app/views/forums/show.html.erb
index 4bbf81668..8e5a6b8e0 100644
--- a/app/views/forums/show.html.erb
+++ b/app/views/forums/show.html.erb
@@ -76,7 +76,7 @@
             $("#error").html("主题 过长（最长为 50 个字符）").show();
             return false;
         }
-       if(memo_content.html().trim().length > 20000){
+       if(memo_content.html().length > 20000){
             $("#error").html("内容 过长（最长为 20000 个字符）").show();
            return false;
         }