diff --git a/app/controllers/admins/laboratory_subjects_controller.rb b/app/controllers/admins/laboratory_subjects_controller.rb
index d552b006e..f25a072a3 100644
--- a/app/controllers/admins/laboratory_subjects_controller.rb
+++ b/app/controllers/admins/laboratory_subjects_controller.rb
@@ -18,7 +18,9 @@ class Admins::LaboratorySubjectsController < Admins::BaseController
     return render_js_error('不能删除自建课程', type: :notify) if current_laboratory_subject.ownership?
 
     current_subject = current_laboratory_subject.subject
-    current_subject.shixuns.destroy_all
+    current_subject.shixuns.each do |shixun|
+      shixun.destroy!
+    end
     current_subject.destroy!
 
     render_delete_success