diff --git a/app/controllers/words_controller.rb b/app/controllers/words_controller.rb
index fa084e349..22b7f1f52 100644
--- a/app/controllers/words_controller.rb
+++ b/app/controllers/words_controller.rb
@@ -106,7 +106,7 @@ class WordsController < ApplicationController
       elsif @journal_destroyed.jour_type == 'HomeworkCommon'
         @homework = HomeworkCommon.find @journal_destroyed.jour_id
         if params[:user_activity_id]
-          @user_activity_id = params[:user_activity_id]
+          @user_activity_id = params[:user_activity_id].to_i
         else
           @user_activity_id = -1
         end
diff --git a/app/views/users/_homework_replies.html.erb b/app/views/users/_homework_replies.html.erb
index de6e96ae3..7f4dc379b 100644
--- a/app/views/users/_homework_replies.html.erb
+++ b/app/views/users/_homework_replies.html.erb
@@ -63,7 +63,7 @@
                     </span>
                     <!--<a action-type="reply"  href="javascript:;" poped="false" class="fr mr20 linkGrey3" title="回复">回复</a>-->
                   <% if User.current.admin? ||is_teacher || comment.user == User.current%>
-                        <%= link_to('删除', {:controller => 'words', :action => 'destroy', :object_id => comment, :user_id => comment.user,:is_in_course => is_in_course, :course_activity => course_activity},
+                        <%= link_to('删除', {:controller => 'words', :action => 'destroy', :object_id => comment, :user_id => comment.user,:is_in_course => is_in_course, :user_activity_id => user_activity_id, :course_activity => course_activity},
                                     :remote => true, :confirm => l(:text_are_you_sure), :method => 'delete', :class => "fr mr20", :title => l(:button_delete))  %>
                     <% end %>
                 </span>