Public places with health certificates refer to the health certificates that operators or employees in public places such as restaurants, accommodation and entertainment need to hold. Mainly to ensure the health and safety of public places and prevent the spread of infectious diseases. The application and review of health certificates are usually the responsibility of the health department, which requires regular physical examination and training. Food grade refers to a grading system in the field of food safety, which is used to evaluate the hygiene standards and quality management in the process of food processing, production and sales. Food grade rating is usually carried out by relevant regulatory agencies, and the hygienic status and management level of food enterprises are evaluated according to food safety regulations and standards. The results of food grading will affect the reputation and market competitiveness of enterprises.