It has the following functions: 1, reporting personal health. Can assist communities, enterprises, schools and other key work such as epidemic prevention management and epidemic control. 2. In the prevention and control of epidemic situation and the resumption of production, scanning health code can realize efficient personnel flow management, improve the inspection efficiency of office buildings, shopping malls, subways, railway stations and other crowded places, and avoid excessive personnel contact and gathering. 3. You can master the personal action track. If someone is diagnosed by COVID-19, the action trajectory of this person's health code will be derived. Through the background database of the system, the health codes of all the people who visited and stayed in the mall on that day will be upgraded for free, such as changing your color from green to dangerous red (this is called big data analysis). Some countermeasures can be taken faster. 4. Health groups such as corridors, communities and enterprises can also be evaluated through big data to understand the overall health status of everyone.