diff --git a/app/models/competition.rb b/app/models/competition.rb
index 9adf6af17..cfcc1c4dc 100644
--- a/app/models/competition.rb
+++ b/app/models/competition.rb
@@ -185,7 +185,6 @@ class Competition < ApplicationRecord
 
   def set_laboratory
     return unless new_record?
-    return if Laboratory.current.blank? || Laboratory.current.main_site?
 
     self.laboratory = Laboratory.current
   end
diff --git a/app/models/course.rb b/app/models/course.rb
index 80be1d895..394d14f47 100644
--- a/app/models/course.rb
+++ b/app/models/course.rb
@@ -415,7 +415,6 @@ class Course < ApplicationRecord
 
   def set_laboratory
     return unless new_record? # 新记录才需要标记
-    return if Laboratory.current.blank? || Laboratory.current.main_site?
 
     self.laboratory = Laboratory.current
   end
diff --git a/app/models/laboratory.rb b/app/models/laboratory.rb
index afee81efc..792f8620e 100644
--- a/app/models/laboratory.rb
+++ b/app/models/laboratory.rb
@@ -11,6 +11,9 @@ class Laboratory < ApplicationRecord
   has_many :laboratory_shixuns, dependent: :destroy
   has_many :laboratory_subjects, dependent: :destroy
 
+  has_many :courses, dependent: :destroy
+  has_many :competitions, dependent: :destroy
+
   validates :identifier, uniqueness: { case_sensitive: false }, allow_nil: true
 
   delegate :name, :navbar, :footer, :login_logo_url, :nav_logo_url, :tab_logo_url, :default_navbar, to: :laboratory_setting
@@ -47,14 +50,6 @@ class Laboratory < ApplicationRecord
     main_site? ? Subject.all : Subject.joins(:laboratory_subjects).where(laboratory_subjects: { laboratory_id: id })
   end
 
-  def courses
-    main_site? ? Course.all : Course.where(laboratory_id: self.id)
-  end
-
-  def competitions
-    main_site? ? Competition.all : Competition.where(laboratory_id: self.id)
-  end
-
   def shixun_repertoires
     where_sql = ShixunTagRepertoire.where("shixun_tag_repertoires.tag_repertoire_id = tag_repertoires.id")