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 contact and other special occupations, must go to a qualified occupational health inspection department to establish health files and physical examination, and apply for health certificates; Engaged in early childhood education, must go to the local maternal and child health care center for health certificate. "Food Safety Law", "Regulations on Hygiene Management in Public Places" and other laws and regulations, professionals engaged in food production and management, public service, cosmetics, disposable medical and health supplies and toxic, harmful and radioactive operations. Relevant personnel in the five major industries of child care must have health certificates.