I have an invention patented in the United States, but have not submitted a patent application in China. Does this invention receive patent protection in China?

1. Unable to obtain protection.

Patents are territorial. In which country you apply, you will get protection in that country.

2. It cannot be used as a trade secret.

Because after a patent is applied for and authorized in the United States, the technical solution of the patent has been made public and cannot be protected as a trade secret.