diff --git a/app/controllers/pull_requests_controller.rb b/app/controllers/pull_requests_controller.rb
index 9cb6e5e23..284c894ba 100644
--- a/app/controllers/pull_requests_controller.rb
+++ b/app/controllers/pull_requests_controller.rb
@@ -89,6 +89,7 @@ class PullRequestsController < ApplicationController
     else
       ActiveRecord::Base.transaction do
         begin
+          return normal_status(-1, "title不能超过255个字符") if params[:title].length > 255
           merge_params
 
           @issue&.issue_tags_relates&.destroy_all if params[:issue_tag_ids].blank?
diff --git a/app/services/pull_requests/create_service.rb b/app/services/pull_requests/create_service.rb
index cc7493ea8..eaf931f38 100644
--- a/app/services/pull_requests/create_service.rb
+++ b/app/services/pull_requests/create_service.rb
@@ -148,6 +148,7 @@ class PullRequests::CreateService < ApplicationService
 
   def validate!
     raise "title参数不能为空" if @params[:title].blank?
+    raise "title不能超过255个字符" if @params[:title].length > 255
     raise "head参数不能为空" if @params[:head].blank?
     raise "base参数不能为空" if @params[:base].blank?
     raise "fork_project_id参数错误" if is_original && !@project.forked_projects.pluck(:id).include?(@params[:fork_project_id].to_i)