I know this very well. If you need to apply to the State Trademark Office, you can go to a trademark agency. You need a certificate from the industrial and commercial department at that time to prove the relationship between the name change of the enterprise, and then submit the application form for the name change of the applicant. There are related forms in fixed format on the website of the Trademark Office. It's not difficult to find a trademark agency to do it for you at a time, it's only a few thousand dollars.