diff --git a/app/views/exercise_questions/_exercise_questions.json.jbuilder b/app/views/exercise_questions/_exercise_questions.json.jbuilder
index 7565a3ab0..bf5e02b3c 100644
--- a/app/views/exercise_questions/_exercise_questions.json.jbuilder
+++ b/app/views/exercise_questions/_exercise_questions.json.jbuilder
@@ -53,7 +53,7 @@ if question.question_type <= 2  #当为选择题或判断题时，只显示选
         standard_answers_array = standard_answers_array.first.to_s.split("")
       end
       array_text_answer = []
-      standard_answers_array.each{|a| array_text_answer.push((a+64).chr)}
+      standard_answers_array.each{|a| array_text_answer.push((a.to_i+64).chr)}
       standard_text = array_text_answer.join("")
     end
     json.standard_answer_show  standard_text