diff --git a/app/controllers/homework_common_controller.rb b/app/controllers/homework_common_controller.rb
index d5e62127d..5cd55e23b 100644
--- a/app/controllers/homework_common_controller.rb
+++ b/app/controllers/homework_common_controller.rb
@@ -206,7 +206,7 @@ class HomeworkCommonController < ApplicationController
 
   #当前用户是不是课程的成员
   def member_of_course
-    render_403 unless User.current.member_of_course?(@course) || User.current.admin?
+    render_403 unless @course.is_public || User.current.member_of_course?(@course) || User.current.admin?
   end
 
   def get_assigned_homeworks(student_works, n, index)