diff --git a/app/helpers/files_helper.rb b/app/helpers/files_helper.rb
index 4b6eccb81..f3be6e904 100644
--- a/app/helpers/files_helper.rb
+++ b/app/helpers/files_helper.rb
@@ -94,9 +94,15 @@ module FilesHelper
   end
 
   def get_qute_number attachment
-    if attachment.copy_from.nil?
+    if attachment.copy_from
+      result = Attachment.find_by_sql("select count(*) as number from attachments where copy_from = #{attachment.copy_from}")
+    else
+      result = Attachment.find_by_sql("select count(*) as number from attachments where copy_from = #{attachment.id}")
+    end
+    if result.nil? || result.count <= 0
       return 0
+    else
+      return result[0].number
     end
-    count = Attachment.find_by_sql("select count(*) from attachments where copy_from = #{attachment.copy_from}")
   end
 end
\ No newline at end of file
diff --git a/app/views/files/_course_list.html.erb b/app/views/files/_course_list.html.erb
index 6e434ed14..93e39f73f 100644
--- a/app/views/files/_course_list.html.erb
+++ b/app/views/files/_course_list.html.erb
@@ -41,7 +41,7 @@
         <p class="f_l c_grey02 font">文件大小：<%= number_to_human_size(file.filesize) %></p>
         <%= link_to( l(:button_delete), attachment_path(file),
                      :data => {:confirm => l(:text_are_you_sure)}, :method => :delete,:class => "f_r re_de") if delete_allowed && file.container_id == @course.id && file.container_type == "Course"%>
-        <p class="f_r c_grey02" ><%= time_tag(file.created_on).html_safe %><%= l(:label_bids_published_ago) %>&nbsp;&nbsp;|&nbsp;&nbsp;下载<%= file.downloads %>&nbsp;&nbsp;<!--|&nbsp;&nbsp;引用<%#=get_qute_number file %>--> </p>
+        <p class="f_r c_grey02" ><%= time_tag(file.created_on).html_safe %><%= l(:label_bids_published_ago) %>&nbsp;&nbsp;|&nbsp;&nbsp;下载<%= file.downloads %>&nbsp;&nbsp;|&nbsp;&nbsp;引用<%= get_qute_number file %> </p>
       </div>
       <div class="cl"></div>
       <div class="tag_h">