diff --git a/app/helpers/export_helper.rb b/app/helpers/export_helper.rb
index 47d3bd7b9..ca76ee953 100644
--- a/app/helpers/export_helper.rb
+++ b/app/helpers/export_helper.rb
@@ -483,7 +483,7 @@ module ExportHelper
           w_14 = nil
         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_16 = w.update_time ? format_time(w.update_time) : "--"
         myshixun_complete = myshixun && myshixun.status == 1
         w_17 = myshixun_complete && w.cost_time ? (game_spend_time w.cost_time) : "未完成"
         teacher_comment = w.shixun_work_comments.select{|comment| comment.challenge_id == 0}.first