diff --git a/app/controllers/pull_requests_controller.rb b/app/controllers/pull_requests_controller.rb
index 39bfadb40..b897a1f96 100644
--- a/app/controllers/pull_requests_controller.rb
+++ b/app/controllers/pull_requests_controller.rb
@@ -70,6 +70,8 @@ class PullRequestsController < ApplicationController
         raise ActiveRecord::Rollback
       end
     end
+  rescue => e
+    normal_status(-1, e.message)
   end
 
   def edit
diff --git a/app/services/pull_requests/create_service.rb b/app/services/pull_requests/create_service.rb
index 6789f904b..844df5cf5 100644
--- a/app/services/pull_requests/create_service.rb
+++ b/app/services/pull_requests/create_service.rb
@@ -13,6 +13,7 @@ class PullRequests::CreateService < ApplicationService
   def call
     ActiveRecord::Base.transaction do
       validate!
+      compare_head_base!
       save_pull_issue!
       save_pull_request!
       save_issue_tags_relates!
@@ -33,7 +34,7 @@ class PullRequests::CreateService < ApplicationService
       assigned_to_id: @params[:assigned_to_id],
       fixed_version_id: @params[:fixed_version_id],
       issue_tags_value: @params[:issue_tag_ids].present? ? @params[:issue_tag_ids].join(",") : "",
-      priority_id: @params[:priority_id] || "2",
+      priority_id: @params[:priority_id],
       issue_classify: "pull_request",
       issue_type: @params[:issue_type] || "1",
       tracker_id: 2,
@@ -155,6 +156,11 @@ class PullRequests::CreateService < ApplicationService
     raise @pull_request.errors.full_messages.join(", ") unless pull_request.valid?
   end
 
+  def compare_head_base!
+    compare_result = Gitea::Repository::Commits::CompareService.call(@owner.login, @project.identifier, @params[:base], @params[:head], @current_user.gitea_token)
+    raise '分支内容相同，无需创建合并请求' if compare_result["Commits"].blank? && compare_result["Diff"].blank?
+  end
+
   def is_original
     @params[:is_original] || false
   end