diff --git a/app/controllers/api/v1/projects/branches_controller.rb b/app/controllers/api/v1/projects/branches_controller.rb
index c0a8ade3b..a4794b61a 100644
--- a/app/controllers/api/v1/projects/branches_controller.rb
+++ b/app/controllers/api/v1/projects/branches_controller.rb
@@ -19,18 +19,14 @@ class Api::V1::Projects::BranchesController < Api::V1::BaseController
     @result_object = Api::V1::Projects::Branches::DeleteService.call(@project, params[:name], current_user&.gitea_token)
     if @result_object
       # 有开启的pr需要一同关闭
-      open_pull_requests = @project.pull_requests.opening.where(head: params[:name]).where(user_id: current_user.id)
-      if open_pull_requests.present?
-        open_pull_requests.each do |pull_request|
-          closed = PullRequests::CloseService.call(@project.owner, @project.repository, pull_request, current_user)
-          if closed === true
-            pull_request.project_trends.create!(user: current_user, project: @project,action_type: ProjectTrend::CLOSE)
-            # 合并请求下issue处理为关闭
-            pull_request.issue&.update_attributes!({status_id:5})
-            SendTemplateMessageJob.perform_later('PullRequestClosed', current_user.id, pull_request.id) if Site.has_notice_menu?
-          end
-        end
+      # 1、删除本仓库中存在未关闭的pr,即本仓库分支1->分支2
+      # 2、如果是fork仓库，考虑删除主仓库中存在未关闭的pr,即本仓库：分支1->主：分支2，同时分两种删除：1删除本仓库分支1，2删除主仓库分支2
+      close_pull_requests_by(@project, params[:name])
+      if @project.forked_from_project_id.present?
+        # fork项目中删除分支
+        close_pull_requests_by(@project.fork_project, params[:name])
       end
+
       return render_ok 
     else
       return render_error('删除分支失败!') 
@@ -52,4 +48,19 @@ class Api::V1::Projects::BranchesController < Api::V1::BaseController
   def branch_params 
     params.require(:branch).permit(:new_branch_name, :old_branch_name)
   end
+
+  def close_pull_requests_by(project, branch_name)
+    open_pull_requests = project.pull_requests.opening.where(head: branch_name).or(a.pull_requests.opening.where(base: branch_name))
+    if open_pull_requests.present?
+      open_pull_requests.each do |pull_request|
+        closed = PullRequests::CloseService.call(project.owner, project.repository, pull_request, current_user)
+        if closed === true
+          pull_request.project_trends.create!(user: current_user, project: project,action_type: ProjectTrend::CLOSE)
+          # 合并请求下issue处理为关闭
+          pull_request.issue&.update_attributes!({status_id:5})
+          SendTemplateMessageJob.perform_later('PullRequestClosed', current_user.id, pull_request.id) if Site.has_notice_menu?
+        end
+      end
+    end
+  end
 end
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