diff --git a/app/controllers/exercise_controller.rb b/app/controllers/exercise_controller.rb
index faaae4997..5510b1539 100644
--- a/app/controllers/exercise_controller.rb
+++ b/app/controllers/exercise_controller.rb
@@ -213,8 +213,19 @@ class ExerciseController < ApplicationController
     if params[:exercise_choice]
       if @exercise_question.question_type == 3
         for i in 1..params[:exercise_choice].count
-          question_standart = @exercise_question.exercise_standard_answers.find_by_id params[:exercise_choice].keys[i]
-          answer_standart = (params[:question_answer].values[i-1].nil? || params[:question_answer].values[i-1].empty?) ? l(:label_new_answer) : params[:question_answer].values[i-1]
+          # 找到对应的标准答案
+          question_standart = @exercise_question.exercise_standard_answers.find_by_id params[:exercise_choice].keys[i-1]
+          # 标准答案值
+          answer_standart = (params[:exercise_choice].values[i-1].nil? || params[:exercise_choice].values[i-1].empty?) ? l(:label_new_answer) : params[:exercise_choice].values[i-1]
+          if question_standart
+            question_standart.answer_text = answer_standart
+            question_standart.save
+          else
+            standart_answer_option = {
+                :answer_text => question_standart
+            }
+            @exercise_question.exercise_standard_answers.new standart_answer_option
+          end
         end
       else
         answer_standart = @exercise_question.exercise_standard_answers.first