Health certificate plays an important role in social life. First of all, a health certificate is a proof of an individual's physical health, which can provide reference for the public to understand the health of others. This is of positive significance for protecting public health and preventing the spread of diseases. Health certificate is necessary in some specific industries and occupations, such as catering service, medical care, children's health care and so on. Persons with health certificates can ensure that they will not pose a potential threat to the health of others at work after relevant health examination and evaluation. Health certificate is also one of the access conditions for some sports events and tourism activities, so as to ensure that the physical condition of the participants meets the relevant requirements and reduce the occurrence of accidents.