diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index b10147462..ceddb9112 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -27,7 +27,7 @@ class CoursesController < ApplicationController
                                      :attahcment_category_list,:export_member_scores_excel, :duplicate_course,
                                      :switch_to_teacher, :switch_to_assistant, :switch_to_student, :exit_course,
                                      :informs, :update_informs, :online_learning, :update_task_position, :tasks_list,
-                                    :join_excellent_course, :export_couser_info, :export_member_act_score, :new_informs]
+                                    :join_excellent_course, :export_couser_info, :export_member_act_score, :new_informs, :delete_informs]
   before_action :user_course_identity, except: [:join_excellent_course, :index, :create, :new, :apply_to_join_course,
                                                 :search_course_list, :get_historical_course_students, :mine, :search_slim, :board_list]
   before_action :teacher_allowed, only: [:update, :destroy, :settings, :search_teacher_candidate,
@@ -36,7 +36,7 @@ class CoursesController < ApplicationController
                                          :add_teacher, :export_couser_info, :export_member_act_score]
   before_action :admin_allowed, only: [:set_invite_code_halt, :set_public_or_private, :change_course_admin,
                                        :set_course_group, :create_group_by_importing_file, :update_informs, :new_informs,
-                                       :update_task_position, :tasks_list]
+                                       :update_task_position, :tasks_list, :delete_informs]
   before_action :teacher_or_admin_allowed, only: [:graduation_group_list, :create_graduation_group, :join_graduation_group,
                                                   :change_course_teacher, :course_group_list,
                                                   :teacher_application_review, :apply_teachers, :delete_course_teacher]
@@ -257,6 +257,12 @@ class CoursesController < ApplicationController
     normal_status("更新成功")
   end
 
+  def delete_informs
+    inform = @course.informs.find_by(id: params[:inform_id])
+    inform.destroy!
+    normal_status("删除成功")
+  end
+
   def online_learning
     @subject = @course.subject
     @stages = @subject&.stages
diff --git a/app/helpers/courses_helper.rb b/app/helpers/courses_helper.rb
index c5d376baf..83c4ded65 100644
--- a/app/helpers/courses_helper.rb
+++ b/app/helpers/courses_helper.rb
@@ -108,6 +108,8 @@ module CoursesHelper
         course_board.present? ? course_board.messages.size : 0
       when "course_group"
         course.course_groups_count
+      when "announcement"
+        course.informs.count
     end
   end
 
diff --git a/config/routes.rb b/config/routes.rb
index 36d4bcfab..5a1590afc 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -353,6 +353,7 @@ Rails.application.routes.draw do
         get 'informs'
         post 'update_informs'
         post 'new_informs'
+        delete 'delete_informs'
         get 'online_learning'
         post 'join_excellent_course'
         get 'tasks_list'