diff --git a/app/controllers/challenges_controller.rb b/app/controllers/challenges_controller.rb
index 9b5f0b869..fdaa30305 100644
--- a/app/controllers/challenges_controller.rb
+++ b/app/controllers/challenges_controller.rb
@@ -230,11 +230,16 @@ class ChallengesController < ApplicationController
   def crud_answer
     raise '参考答案不能为空' if params[:challenge_answer].empty?
     raise '占比之和必须为100%' if params[:challenge_answer].map{|a| a[:score]}.sum != 100
-    @challenge.challenge_answers.destroy_all if @challenge.challenge_answers
-    params[:challenge_answer].each_with_index do |answer, index|
-      ChallengeAnswer.create(name: answer[:name], contents: answer[:contents],
-                             level: index+1, score: answer[:score], challenge_id: @challenge.id)
+    ActiveRecord::Base.transaction do
+      @challenge.challenge_answers.destroy_all if @challenge.challenge_answers
+      params[:challenge_answer].each_with_index do |answer, index|
+        # 内容为空不保存
+        next if answer[:contents].blank?
+        ChallengeAnswer.create(name: answer[:name], contents: answer[:contents],
+                               level: index+1, score: answer[:score], challenge_id: @challenge.id)
+      end
     end
+
   end
 
   # 查看参考答案接口