diff --git a/vendor/built_in_modules/survey/app/controllers/panel/survey/back_end/surveys_controller.rb b/vendor/built_in_modules/survey/app/controllers/panel/survey/back_end/surveys_controller.rb
index c221df87f..8e362745f 100644
--- a/vendor/built_in_modules/survey/app/controllers/panel/survey/back_end/surveys_controller.rb
+++ b/vendor/built_in_modules/survey/app/controllers/panel/survey/back_end/surveys_controller.rb
@@ -232,7 +232,9 @@ class Panel::Survey::BackEnd::SurveysController < OrbitBackendController
     @survey = ::Survey.find(params[:id])
     @chart_data, @survey_questions, @survey_answers = @survey.generate_chart_data
 
-    csv = CSV.generate do |csv|
+    head = 'EF BB BF'.split(' ').map{|a|a.hex.chr}.join()
+
+    csv = CSV.generate(csv = head) do |csv|
       row = []
       @survey_questions.each do |question|
         row << question.title
@@ -277,7 +279,7 @@ class Panel::Survey::BackEnd::SurveysController < OrbitBackendController
         @survey_questions.each do |question|
           if question.type == ::SurveyQuestion::Radiogroup
             options = Hash[question.survey_question_options.collect{|o| [ o.id.to_s, o.name ] }]
-            row << Hash[answer[question.id.to_s].map {|o, g| [options[o], g]}]
+            row << Hash[answer[question.id.to_s].map {|o, g| [options[o], g]}] if !answer[question.id.to_s].blank?
           else
             row << answer[question.id.to_s]
           end
@@ -289,11 +291,16 @@ class Panel::Survey::BackEnd::SurveysController < OrbitBackendController
     end
 
     respond_to do |format|
-      format.csv do
-        response.headers["Content-Type"] = "text/csv; charset=big5"
-        render :text => csv.encode('Big5')
-      end
+      format.html
+      format.csv { send_data csv }
     end
+
+    # respond_to do |format|
+    #   format.csv do
+    #     response.headers["Content-Type"] = "text/csv; charset=big5"
+    #     render :text => csv.encode('Big5')
+    #   end
+    # end
   end
 
   def set_answers