diff --git a/app/controllers/poll_controller.rb b/app/controllers/poll_controller.rb
index a63f9e8f6..2f8a26c2a 100644
--- a/app/controllers/poll_controller.rb
+++ b/app/controllers/poll_controller.rb
@@ -89,7 +89,7 @@ class PollController < ApplicationController
   def create_poll_question
     question_title = params[:poll_questions_title].nil? || params[:poll_questions_title].empty? ? l(:label_enter_single_title) : params[:poll_questions_title]
     option = {
-        :is_necessary => params[:is_necessary] || 1,
+        :is_necessary => (params[:is_necessary]=="true" ? 1 : 0),
         :question_title => question_title,
         :question_type => params[:question_type] || 1,
         :question_number => @poll.poll_questions.count + 1
diff --git a/app/views/poll/_edit_MC.html.erb b/app/views/poll/_edit_MC.html.erb
index 9c34e1d51..6010132fb 100644
--- a/app/views/poll/_edit_MC.html.erb
+++ b/app/views/poll/_edit_MC.html.erb
@@ -6,7 +6,7 @@
           <label>问题：&nbsp;&nbsp;</label>
           <input type="hidden" name="question_type" value="<%= poll_question.question_type%>"/>
           <input class="ur_question_title" type="text" name="poll_questions_title" id="poll_questions_title_<%=poll_question.id%>" placeholder="请输入单选题标题" value="<%= poll_question.question_title%>"/>
-          <input type="checkbox" name="is_necessary" value="true" checked = "<%= poll_question.is_necessary == 1%>"/>
+          <input type="checkbox" name="is_necessary" value="true" <%= poll_question.is_necessary == 1 ? "checked" : ""%>/>
           <label>必答</label>
         </div>
         <div class="ur_editor_content">