What kind of medical check do you mean? I found an Entrance Regulation from this website that 'Those who came from yellow-fever infected areas must show valid vaccination certificates to the inspection and quarantine authorities and those who suffer from leprosy, AIDS/HIV infection, VD (venereal disease) and tuberculosis are prohibited from entry.' For more info, please refer to this page: https://www.travelchinaguide.com/faq/index-2.htm