According to the "Measures for the Administration of Health Certificates in People's Republic of China (PRC)", the health certificate is valid for one year, and it will be re-applied at the designated hospital after its expiration.
Health certificate refers to the certificate of preventive health examination, which proves that the examinee has the health quality required by practice, mainly including those engaged in the production and operation of food and drinking water, those directly engaged in the production of cosmetics, those who directly serve customers in public places and those who are harmful to workers.