Hi @rhessinger
Thanks for your guidance,i am solved it now .

Thanks,But follow your step,I still can't prevent the package from being overwritten,I used the paket.exe tool to upload the package,And A key is created as the administrator,Does it have anything to do with the setting of this key?

I already have a package naming "AAA-1.0.0.1.nupkg" on the server,When i upload it again ,the package will be overwritten ,How do you prevent uploading the same version of a package without overwriting an existing package on the server.