diff --git a/app/controllers/bids_controller.rb b/app/controllers/bids_controller.rb
index cc6ea91dd..32878a2cd 100644
--- a/app/controllers/bids_controller.rb
+++ b/app/controllers/bids_controller.rb
@@ -17,6 +17,7 @@ class BidsController < ApplicationController
   helper :watchers
   helper :attachments
   include AttachmentsHelper
+  include ApplicationHelper
   helper :projects
   helper :words
   def index
@@ -723,24 +724,33 @@ class BidsController < ApplicationController
     if User.current.logged? && (!Member.where('user_id = ? and project_id = ?', User.current.id, @bid.courses.first.id).first.nil? && (Member.where('user_id = ? and project_id = ?', User.current.id, @bid.courses.first.id).first.roles&Role.where('id = ? or id = ? or id =?',5, 10, 7)).size >0)
       # homework = HomeworkAttach.create(:bid_id => @bid.id, :user_id => User.current.id)
       # homework.save_attachments(params[:attachments] || (params[:bid] && params[:bid][:uploads]))
-      @homework = HomeworkAttach.new
-      @homework.safe_attributes = params[:homeworkattach]
-      @homework.bid_id = @bid.id
-      @homework.user_id = User.current.id
-      @homework.save_attachments(params[:attachments])
-      render_attachment_warning_if_needed(@homework)
-      if @homework.save
-        @homework_flag = l(:label_bidding_homework_succeed)
+      
+      if hadcommittedhomework(User.current.id, @bid.id) == true
+          @homework_flag = l(:label_bidding_homework_committed)
       else
-        @homework_flag = l(:label_bidding_homework_failed)
-      end
-      if @homework.attachments.empty?
-        @homework.delete
-        flash[:error] = l(:no_attachmens_allowed)
-        @homework_flag = l(:no_attachmens_allowed)
-      # else
-      end
+          @homework = HomeworkAttach.new    
+          @homework.safe_attributes = params[:homeworkattach]
+          @homework.bid_id = @bid.id
+          @homework.user_id = User.current.id
+          @homework.save_attachments(params[:attachments])     
+
+          render_attachment_warning_if_needed(@homework)
+      
+          if @homework.save
+              @homework_flag = l(:label_bidding_homework_succeed)
+          else
+              @homework_flag = l(:label_bidding_homework_failed)
+          end 
+     
+          if @homework.attachments.empty?
+              @homework.delete
+              #flash[:error] = l(:no_attachmens_allowed)
+              @homework_flag = l(:no_attachmens_allowed)
+              # else
+          end
+      end 
     end
+    
     @homework_list = @bid.homeworks
     respond_to do |format|
       format.html{
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 97e76a0c9..28df9a281 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -1489,4 +1489,14 @@ module ApplicationHelper
       obj2 = obj1
     end
   end
+  
+  def hadcommittedhomework(cur,curb)
+    @attaches=HomeworkAttach.find_by_sql("select * from homework_attaches where(bid_id = #{curb})")
+    @attaches.each do |attach|
+      if attach.user_id == cur
+       return true
+      end
+    end
+  end
+  
 end
diff --git a/app/helpers/attachments_helper.rb b/app/helpers/attachments_helper.rb
index 0ba0f3554..421860860 100644
--- a/app/helpers/attachments_helper.rb
+++ b/app/helpers/attachments_helper.rb
@@ -69,5 +69,14 @@ module AttachmentsHelper
   def deletable? container, user=User.current
     User.current.logged? && (container.author == user || user.admin?)
   end
+  
+  def hadcommittedhomework(cur,curb)
+    @attaches=HomeworkAttach.find_by_sql("select * from homework_attaches where(bid_id = #{curb})")
+    @attaches.each do |attach|
+      if attach.user_id == cur
+        retrun true
+      end
+    end
+  end
 
 end
diff --git a/app/views/bids/_homework.html.erb b/app/views/bids/_homework.html.erb
index 5094d0c0a..eb6b9bbf5 100644
--- a/app/views/bids/_homework.html.erb
+++ b/app/views/bids/_homework.html.erb
@@ -9,9 +9,7 @@
 			<%= render :partial => 'attachments/form' %>
 		</p>
 	</fieldset>
-	<%= submit_tag l(:button_create), 
-									:onclick => "return true;"
-	%>
+	<%= submit_tag l(:button_create), :onclick => "return true" %>
 	<% end %>
 	<script type="text/javascript">
 		function j_submit () {
diff --git a/config/locales/zh.yml b/config/locales/zh.yml
index c90a45656..14f5f080f 100644
--- a/config/locales/zh.yml
+++ b/config/locales/zh.yml
@@ -1338,6 +1338,7 @@ zh:
   label_bidding_contest_succeed: 竞赛提交成功   #added by bai
   label_bidding_homework_succeed: 作业提交成功   #added by bai
   label_bidding_homework_failed: 作业提交失败   #added by bai
+  label_bidding_homework_committed: 你已经提交过作业，不能重复提交！
   label_bidding_fail: 应标失败，该项目已经应标
   label_bidding_homework_fail: 作业提交失败，该作业已经被提交！