diff --git a/app/views/layouts/_logined_header.html.erb b/app/views/layouts/_logined_header.html.erb
index 378741035..b8235ff1c 100644
--- a/app/views/layouts/_logined_header.html.erb
+++ b/app/views/layouts/_logined_header.html.erb
@@ -14,9 +14,12 @@
           <li class="navHomepageMenu fl">
             <%= link_to "题库",  user_homeworks_user_path(User.current), :class => "c_white f16 db p10"%>
           </li>
-          <li class="navHomepageMenu fl mr30">
-            <%= link_to "帮助中心", "https://#{Setting.host_name}/forums/1/memos/1168", :class =>"c_white f16 db p10" %>
-          </li>
+          <% memo = Memo.where(:id => 1168).first %>
+          <% unless memo.nil? %>
+              <li class="navHomepageMenu fl mr30">
+                <%= link_to "帮助中心", "https://#{Setting.host_name}/forums/1/memos/1168", :class =>"c_white f16 db p10" %>
+              </li>
+          <% end %>
       <% else %>
           <li class="navHomepageMenu fl mr40">
             <a href="<%= forums_path(:reorder_complex=>'desc')%>" target="_blank" class="c_white f16 db p10" >公共贴吧</a>