If you need a formal patent legal document, you can ask China National Intellectual Property Administration to issue a copy of the patent register.
Download and fill in the request for copying documents in the "Service Area and Form Download" on the left side of the homepage of China National Intellectual Property Administration website, and send it by registered mail to the issuing room of the preliminary examination process department of China National Intellectual Property Administration. At present, this program is free.
PS: The patent certificate can only prove the legal status of the patent on the date of authorization, and the subsequent legal status shall be subject to that recorded in the patent register.