Health codes are based on real data and can be generated by citizens or people who have returned to work through online declaration and background audit. As an individual entering and leaving electronic certificate locally, the QR code can be declared once, which is universal in the whole city.
The application of health code covers community management, enterprises' resumption of work, transportation, school opening, drug purchase registration, supermarkets and shopping malls, etc., which can help communities, enterprises and schools to do key work such as epidemic prevention management and epidemic control.