diff --git a/app/services/api/v1/issues/update_service.rb b/app/services/api/v1/issues/update_service.rb
index 895c98c5c..c03a868b1 100644
--- a/app/services/api/v1/issues/update_service.rb
+++ b/app/services/api/v1/issues/update_service.rb
@@ -79,7 +79,7 @@ class Api::V1::Issues::UpdateService < ApplicationService
       #Pm相关
       @updated_issue.pm_project_id = @target_pm_project_id unless @target_pm_project_id.nil?
       @updated_issue.pm_sprint_id = @pm_sprint_id unless @pm_sprint_id.nil?
-      @updated_issue.pm_issue_type = @pm_issue_type unless @pm_issue_type.nil?
+      @updated_issue.pm_issue_type = @pm_issue_type unless @pm_issue_type.nil? && @pm_issue_type.children_issues.count > 0 && @pm_issue_type.parent_id.present?
       @updated_issue.root_id = @root_id unless @root_id.nil? #不为 nil的时候更新
       @updated_issue.root_id = nil if @root_id.try(:zero?) #为 0 的时候设置为 nil
       @updated_issue.time_scale = @time_scale unless @time_scale.nil?