diff --git a/app/services/api/pm/issues/update_service.rb b/app/services/api/pm/issues/update_service.rb
index 21119ca9b..2f1816446 100644
--- a/app/services/api/pm/issues/update_service.rb
+++ b/app/services/api/pm/issues/update_service.rb
@@ -85,6 +85,10 @@ class Api::Pm::Issues::UpdateService < ApplicationService
       @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?
+      if @project_id.present? && @updated_issue.project_id.to_i == 0
+        add_project = Project.find_by(id: @project_id)
+        @updated_issue.project_issues_index = add_project.get_last_project_issues_index + 1 if add_project.present?
+      end
       @updated_issue.project_id = @project_id unless @project_id.nil?
       @updated_issue.updated_on = Time.now
       @updated_issue.changer_id = @current_user.id
diff --git a/app/services/api/v1/issues/update_service.rb b/app/services/api/v1/issues/update_service.rb
index 6d2bbedf0..d92513ec5 100644
--- a/app/services/api/v1/issues/update_service.rb
+++ b/app/services/api/v1/issues/update_service.rb
@@ -85,7 +85,7 @@ class Api::V1::Issues::UpdateService < ApplicationService
       @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?
-      if @project_id.present? && @project_id.to_i == 0
+      if @project_id.present? && @updated_issue.project_id.to_i == 0
         add_project = Project.find_by(id: @project_id)
         @updated_issue.project_issues_index = add_project.get_last_project_issues_index + 1 if add_project.present?
       end