diff --git a/app/controllers/api/pm/issues_controller.rb b/app/controllers/api/pm/issues_controller.rb
index 0263a115a..162ce7bcf 100644
--- a/app/controllers/api/pm/issues_controller.rb
+++ b/app/controllers/api/pm/issues_controller.rb
@@ -1,7 +1,7 @@
 class Api::Pm::IssuesController < Api::Pm::BaseController
   before_action :require_login, except: [:index]
   before_action :load_project
-  before_action :load_issue, only: %i[show update destroy link_index link_issues]
+  before_action :load_issue, only: %i[show update destroy link_index link_issues parent_issues]
   before_action :load_issues, only: %i[batch_update batch_destroy]
   before_action :check_issue_operate_permission, only: %i[update destroy]
 
@@ -40,6 +40,19 @@ class Api::Pm::IssuesController < Api::Pm::BaseController
     render 'api/v1/issues/index'
   end
 
+  def parent_issues
+    @issues = Issue.where(pm_project_id: params[:pm_project_id])
+                   .where.not(id: @issue.id)
+                   .where.not(id: Issue.full_children_issues(@issue).map{|i|i.id}) 
+    if params[:only_name].present?
+      @issues = kaminary_select_paginate(
+        @issues.select(:id, :subject, :project_issues_index, :updated_on, :created_on))
+    else
+      @issues = @issues.includes(:priority, :issue_status, :user, :show_assigners, :show_issue_tags, :version, :comment_journals)
+      @issues = kaminari_paginate(@issues)
+    end
+  end
+
   def show
     @issue.associate_attachment_container
     render 'api/v1/issues/show'
diff --git a/app/models/issue.rb b/app/models/issue.rb
index b91dbb26a..b40efefa1 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -296,4 +296,12 @@ class Issue < ApplicationRecord
     end 
   end
 
+  def self.full_children_issues(issue, issues = [])
+    issue.children_issues.each do |i| 
+      issues << i
+      full_children_issues(i, issues)
+    end
+    issues
+  end
+
 end
diff --git a/app/services/api/v1/issues/concerns/checkable.rb b/app/services/api/v1/issues/concerns/checkable.rb
index 287fae2f6..8067262e2 100644
--- a/app/services/api/v1/issues/concerns/checkable.rb
+++ b/app/services/api/v1/issues/concerns/checkable.rb
@@ -12,6 +12,10 @@ module Api::V1::Issues::Concerns::Checkable
     raise ApplicationService::Error, "Milestone不存在！" unless Version.find_by_id(milestone_id).present?
   end
 
+  def check_root_issue(issue, root_id) 
+    raise ApplicationService::Error, "父工作项与当前工作项已存在父子关系！" if Issue.full_children_issues(issue).map{|i| i.id}.include?(root_id)
+  end
+
   def check_issue_tags(issue_tag_ids)
     raise ApplicationService::Error, "请输入正确的标记ID数组！" unless issue_tag_ids.is_a?(Array)
     raise ApplicationService::Error, "最多可选择3个标记" if issue_tag_ids.size > 3
diff --git a/app/services/api/v1/issues/update_service.rb b/app/services/api/v1/issues/update_service.rb
index 6938bc946..7134197ab 100644
--- a/app/services/api/v1/issues/update_service.rb
+++ b/app/services/api/v1/issues/update_service.rb
@@ -5,6 +5,7 @@ class Api::V1::Issues::UpdateService < ApplicationService
 
   attr_reader :project, :issue, :current_user
   attr_reader :status_id, :priority_id, :milestone_id, :branch_name, :start_date, :due_date, :subject, :description, :blockchain_token_num
+  attr_reader :target_pm_project_id, :pm_sprint_id, :pm_issue_type, :root_id, :time_scale
   attr_reader :issue_tag_ids, :assigner_ids, :attachment_ids, :receivers_login, :before_issue_tag_ids, :before_assigner_ids, :project_id
   attr_accessor :add_assigner_ids, :previous_issue_changes, :updated_issue, :atme_receivers
 
@@ -46,6 +47,7 @@ class Api::V1::Issues::UpdateService < ApplicationService
       check_issue_status(status_id) if status_id.present?
       check_issue_priority(priority_id) if priority_id.present?
       check_milestone(milestone_id) if milestone_id.present?
+      check_root_issue(issue, root_id) if root_id.present?
       check_issue_tags(issue_tag_ids) unless issue_tag_ids.nil?
       check_assigners(assigner_ids) unless assigner_ids.nil?
       check_attachments(attachment_ids) unless attachment_ids.nil?
diff --git a/app/views/api/pm/issues/parent_issues.json.jbuilder b/app/views/api/pm/issues/parent_issues.json.jbuilder
new file mode 100644
index 000000000..a9a930d6a
--- /dev/null
+++ b/app/views/api/pm/issues/parent_issues.json.jbuilder
@@ -0,0 +1,8 @@
+json.total_count @issues.total_count 
+json.issues @issues.each do |issue| 
+  if params[:only_name].present? 
+    json.(issue, :id, :subject, :project_issues_index)
+  else 
+    json.partial! "api/v1/issues/simple_detail", locals: {issue: issue}
+  end
+end
\ No newline at end of file
diff --git a/config/routes/api.rb b/config/routes/api.rb
index bf38eceaf..ee89921b6 100644
--- a/config/routes/api.rb
+++ b/config/routes/api.rb
@@ -11,6 +11,7 @@ defaults format: :json do
         end
         member do
           get :link_index
+          get :parent_issues
         end
 
         resources :issue_links