diff --git a/app/helpers/watchers_helper.rb b/app/helpers/watchers_helper.rb
index 9a77b436e..a56727665 100644
--- a/app/helpers/watchers_helper.rb
+++ b/app/helpers/watchers_helper.rb
@@ -71,6 +71,9 @@ module WatchersHelper
   # Somebody may use option params
   def join_in_course(course, user, options=[])
     return '' unless user && user.logged?
+    # modify by nwb
+    # 主讲教师不允许退出课程
+    return '' if user.id == course.tea_id
     joined = user.member_of_course?(course)
     text = joined ? l(:label_exit_course) : l(:label_join_course)
     url_t = join_path(:object_id => course.id)
@@ -85,6 +88,9 @@ module WatchersHelper
   
   def join_in_course_for_list(course, user, options=[])
     return '' unless user && user.logged?
+    # modify by nwb
+    # 主讲教师不允许退出课程
+    return '' if user.id == course.tea_id
     joined = user.member_of_course?(course)
     text = joined ? l(:label_exit_course) : l(:label_join_course)
     url_t = join_path(:object_id => course.id)