It mainly depends on what occupation you are engaged in. Health service personnel in public places, such as hotel waiters, must pass the physical examination of the Center for Disease Control and Prevention and issue a health certificate, which is valid for one year. Engaged in mining, radioactive exposure and other special occupations, personnel must go to qualified occupational health inspection departments to establish health records and health checks, and apply for health certificates; Engaged in early childhood education, must go to the local maternal and child health hospital for health certificate. The Food Safety Law, Regulations on Hygiene Management in Public Places and other laws and regulations stipulate that relevant personnel engaged in food production and management, public service, cosmetics, disposable medical and health care products and other professional production, toxic and hazardous and radioactive operations, and kindergartens must hold health certificates.