Excuse me, is there any physical proof after successfully applying for a patent online?

No matter which application method (face-to-face, mail, online electronic application) is adopted, as long as the patent is authorized, China National Intellectual Property Administration will issue the patent certificate in kind.

There is only one case in which a patent certificate is not issued after a patent is granted: that is, 5 yuan stamp duty is not paid when the registration formalities are completed.