diff --git a/app/views/forums/show.html.erb b/app/views/forums/show.html.erb
index 5bbc52db2..05c086ed4 100644
--- a/app/views/forums/show.html.erb
+++ b/app/views/forums/show.html.erb
@@ -128,8 +128,8 @@
             $("#error").html("主题 过长（最长为 50 个字符）").show();
             return false;
         }
-        if(memo_content.html().length > 30000){
-            $("#error").html("内容 过长（最长为 30000 个字符）").show();
+        if(memo_content.html().length > 20000){
+            $("#error").html("内容 过长（最长为 20000 个字符）").show();
             $("html,body").animate({scrollTop:$("#error").offset().top},1000)
             return false;
         }
diff --git a/app/views/memos/edit.html.erb b/app/views/memos/edit.html.erb
index b2b7d73f0..cace5bcc8 100644
--- a/app/views/memos/edit.html.erb
+++ b/app/views/memos/edit.html.erb
@@ -7,8 +7,8 @@
               $("#error").html('主题不能超过50个字符').show();
               return;
           }
-          if(memo_content.html().length > 30000){
-              $("#error").html("内容 过长（最长为 30000 个字符）").show();
+          if(memo_content.html().length > 20000){
+              $("#error").html("内容 过长（最长为 20000 个字符）").show();
               $("html,body").animate({scrollTop:$("#error").offset().top},1000)
               return false;
           }