diff --git a/app/controllers/forks_controller.rb b/app/controllers/forks_controller.rb
index 53b043f49..7d7db9350 100644
--- a/app/controllers/forks_controller.rb
+++ b/app/controllers/forks_controller.rb
@@ -12,7 +12,7 @@ class ForksController < ApplicationController
   def authenticate_project!
     if current_user&.id == @project.user_id && (params[:new_identifier].blank? || params[:new_identifier] == @project.identifier)
       render_result(-1, "自己不能fork自己的项目")
-    elsif Project.exists?(user_id: current_user.id, identifier: @project.identifier)
+    elsif Project.exists?(user_id: current_user.id, identifier: (params[:new_identifier] || @project.identifier))
       render_result(0, "fork失败，你已拥有了这个项目")
     end
     # return if current_user != @project.owner