Health certificate refers to the proof of preventive health examination, which proves that the examinee has the health quality to engage in the prescribed business. Health certificate mainly involves six diseases in five industries, which largely protects the health of employees and clients. Health certificate refers to the pre-post, pre-post and age-appropriate health examination for personnel engaged in food and drinking water production and management, personnel directly engaged in cosmetics production, personnel who directly serve customers in public places, hazardous workers, radiation workers and school students according to the provisions of national health laws and regulations. According to the Food Safety Law, Regulations on Hygiene Management in Public Places and other laws and regulations, relevant personnel engaged in food production and management, public service, professional production of cosmetics, disposable medical and health care products, toxic and hazardous and radioactive operations, and child care institutions must hold health certificates.