diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index 98c70e0b4..7ebf7435d 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -467,7 +467,8 @@ class CoursesController < ApplicationController
     # user_ids_of_course_members = @course.course_members.where(role: [1,2,3]).pluck(:user_id)
     # @users = User.where.not(id: user_ids_of_course_members)
 
-    @users = User.where(status: User::STATUS_ACTIVE, laboratory_id: @course.laboratory_id)
+    @users = User.where(status: User::STATUS_ACTIVE)
+    @users = @users.where(laboratory_id: current_laboratory.id) unless current_laboratory.main_site?
     @users = @users.where("concat(users.lastname, users.firstname) like '%#{name}%'") if name.present?
     # REDO:Extension
     @users = @users.joins(user_extension: :school).where("schools.name like '%#{school_name}%'") if school_name.present?
@@ -1083,7 +1084,8 @@ class CoursesController < ApplicationController
     school_name = params[:school_name]
 
     # REDO:Extension
-    @users = User.where(status: User::STATUS_ACTIVE, laboratory_id: @course.laboratory_id)
+    @users = User.where(status: User::STATUS_ACTIVE)
+    @users = @users.where(laboratory_id: current_laboratory.id) unless current_laboratory.main_site?
     @users = @users.where("concat(users.lastname, users.firstname) like '%#{name}%'") if name.present?
     # REDO:Extension
     @users = @users.joins(user_extension: :school).where("schools.name like '%#{school_name}%'") if school_name.present?
diff --git a/app/controllers/shixuns_controller.rb b/app/controllers/shixuns_controller.rb
index 619d2c8a7..9077192cf 100644
--- a/app/controllers/shixuns_controller.rb
+++ b/app/controllers/shixuns_controller.rb
@@ -919,6 +919,7 @@ class ShixunsController < ApplicationController
 		else
 			@users = User.none
 		end
+		@users = @users.where(laboratory_id: current_laboratory.id) unless current_laboratory.main_site?
 		page = params[:page] || 1
 		limit = params[:limit] || 20
 		@user_count = @users.count
diff --git a/app/controllers/subjects_controller.rb b/app/controllers/subjects_controller.rb
index 25cf93faa..d4f1281a2 100644
--- a/app/controllers/subjects_controller.rb
+++ b/app/controllers/subjects_controller.rb
@@ -302,6 +302,7 @@ class SubjectsController < ApplicationController
     member_ids = @subject.subject_members.map(&:user_id).join(',')
     condition = "%#{params[:search].strip}%".gsub(" ","")
     @users = User.where("id not in (?) and status = 1 and LOWER(concat(lastname, ifnull(firstname, ''), login)) LIKE ?", member_ids, "#{condition}")
+    @users = @users.where(laboratory_id: current_laboratory.id) unless current_laboratory.main_site?
 
     @users = @users.page(page).per(10)
     @users = @users.includes(:user_extension)
diff --git a/app/controllers/users/recent_contacts_controller.rb b/app/controllers/users/recent_contacts_controller.rb
index ea8e005d1..2576385b2 100644
--- a/app/controllers/users/recent_contacts_controller.rb
+++ b/app/controllers/users/recent_contacts_controller.rb
@@ -3,6 +3,7 @@ class Users::RecentContactsController < Users::BaseController
 
   def index
     contacts  = observed_user.recent_contacts.distinct
-    @contacts = contacts.where(laboratory_id: current_laboratory.id).order('private_messages.created_at DESC').limit(10).includes(:user_extension)
+    contacts = contacts.where(laboratory_id: current_laboratory.id) unless current_laboratory.main_site?
+    @contacts = contacts.order('private_messages.created_at DESC').limit(10).includes(:user_extension)
   end
 end
\ No newline at end of file
diff --git a/app/controllers/users_for_private_messages_controller.rb b/app/controllers/users_for_private_messages_controller.rb
index 1caf52a6c..610bf5d52 100644
--- a/app/controllers/users_for_private_messages_controller.rb
+++ b/app/controllers/users_for_private_messages_controller.rb
@@ -2,7 +2,8 @@ class UsersForPrivateMessagesController < ApplicationController
   before_action :require_login, :check_auth
 
   def index
-    users = User.active.where.not(id: current_user.id).where(laboratory_id: current_laboratory.id)
+    users = User.active.where.not(id: current_user.id)
+    users = users.where(laboratory_id: current_laboratory.id) unless current_laboratory.main_site?
 
     keyword = params[:keyword].to_s.strip
     if keyword.blank?