diff --git a/app/models/challenge.rb b/app/models/challenge.rb
index 704fffb3..e5054c9b 100644
--- a/app/models/challenge.rb
+++ b/app/models/challenge.rb
@@ -20,7 +20,7 @@ class Challenge < ActiveRecord::Base
   # validates_presence_of :score
   validates_presence_of :task_pass
   validates_length_of :subject, :maximum => 255
-  scope :min, lambda { select([:id, :subject, :position, :shixun_id, :st, :score, :path, :task_pass, :modify_time, :web_route, :answer]) }
+  scope :min, lambda { select([:id, :subject, :position, :shixun_id, :st, :score, :exec_time, :path, :task_pass, :modify_time, :web_route, :answer]) }
   scope :choose_type, lambda{where(st: 1)}
   scope :practice_type, lambda{where(st: 0)}