diff --git a/app/models/issue.rb b/app/models/issue.rb
index ffda5a189..b91dbb26a 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -67,6 +67,7 @@ class Issue < ApplicationRecord
   belongs_to :version, foreign_key: :fixed_version_id,optional: true, counter_cache: true
   belongs_to :user,optional: true, foreign_key: :author_id
   belongs_to :issue_status, foreign_key: :status_id,optional: true
+  belongs_to :parent_issue, class_name: 'Issue', optional: true, foreign_key: :root_id, counter_cache: :child_count
   has_many :commit_issues
   has_many :attachments, as: :container, dependent: :destroy
   # has_many :memos
@@ -103,7 +104,7 @@ class Issue < ApplicationRecord
   scope :closed, ->{where(status_id: 5)}
   scope :opened, ->{where.not(status_id: 5)}
   after_create :incre_project_common, :incre_user_statistic, :incre_platform_statistic
-  after_save :change_versions_count, :send_update_message_to_notice_system, :associate_attachment_container,  :refresh_root_issue_count, :generate_uuid
+  after_save :change_versions_count, :send_update_message_to_notice_system, :associate_attachment_container, :generate_uuid
   after_destroy :update_closed_issues_count_in_project!, :decre_project_common, :decre_user_statistic, :decre_platform_statistic
 
   def incre_project_common
@@ -128,6 +129,7 @@ class Issue < ApplicationRecord
     root_count = Issue.where(root_id: root_id).count
     root_issue.update(child_count: root_count)
   end
+
   def incre_platform_statistic
     CacheAsyncSetJob.perform_later('platform_statistic_service', {issue_count: 1})
   end