A health certificate is a document that records an individual's health status, and is usually issued by a hospital or relevant institution. When issuing a health certificate, the hospital will enter personal health information, including physical examination results and vaccination records. The purpose of this is to establish a reliable health record, which is convenient for medical staff to consult and analyze personal health status when necessary, so as to provide better medical services and health management suggestions. At the same time, entering hospital information also contributes to the statistics and analysis of a large number of health data, and provides support for public health and disease prevention and control.