diff --git a/app/helpers/export_helper.rb b/app/helpers/export_helper.rb
index b08cbb549..742deb85b 100644
--- a/app/helpers/export_helper.rb
+++ b/app/helpers/export_helper.rb
@@ -163,7 +163,7 @@ module ExportHelper
         end
         w_15 = w.work_score.nil? ? "--" : w.work_score.round(1)
         w_16 = w.update_time ? format_time(w.update_time) : "--"  "更新时间"
-        w_17 = w.cost_time
+        w_17 = (game_spend_time w.cost_time)
         teacher_comments = w.student_works_scores
         if teacher_comments.present?
           w_18 = ""
@@ -173,7 +173,6 @@ module ExportHelper
             user_score = t&.score
             user_comment = t.comment.present? ? t.comment : "--"
             comment_title = "#{user_name}： #{user_time.to_s}  #{user_score.to_s}分\n#{user_comment}\n\n"
-            # ("教师:" + user_name + "\n" + "时间:" + user_time.to_s + "\n" + "分数:" + user_score.to_s + "分" + "\n" + "评语:" + user_comment + "\n\n")
             w_18 = w_18 + comment_title
           end
         else
diff --git a/app/views/student_works/shixun_work.json.jbuilder b/app/views/student_works/shixun_work.json.jbuilder
index 74c33420e..39e7eb1b3 100644
--- a/app/views/student_works/shixun_work.json.jbuilder
+++ b/app/views/student_works/shixun_work.json.jbuilder
@@ -22,7 +22,7 @@ index = 1
 json.game_list @myshixun.games do |game|
   json.position index
   json.end_time game.end_time ? game.end_time : '--'
-  json.cost_time game.cost_time
+  json.cost_time (game_spend_time game.cost_time)
   json.score game.final_score
   json.complete_status game_status(game, @homework)
   index += 1