diff --git a/app/controllers/pull_requests_controller.rb b/app/controllers/pull_requests_controller.rb
index f5735d194..40bf61d78 100644
--- a/app/controllers/pull_requests_controller.rb
+++ b/app/controllers/pull_requests_controller.rb
@@ -179,6 +179,7 @@ class PullRequestsController < ApplicationController
 
   def pr_merge
     return render_forbidden("你没有权限操作.") unless @project.operator?(current_user)
+    return normal_status(-1, "该分支存在冲突，无法自动合并.") unless @pull_request.conflict_files.blank?
 
     if params[:do].blank?
       normal_status(-1, "请选择合并方式")