diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index 5d8c1408f..5c03dffee 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -1160,7 +1160,7 @@ class CoursesController < ApplicationController
       user_login = user.login
       user_name = user.real_name
       user_mail = user.mail
-      user_stu_id = user.student_id.present? ? (user.student_id.to_s + "\t") : "--"
+      user_stu_id = u.student_id.present? ? (u.student_id.to_s + "\t") : "--"
       user_course_group = u.course_group_name
       user_info_array = [user_login,user_name,user_mail,user_stu_id,user_course_group]   #用户的信息集合
       user_work_scores = []