Health code is based on personal health, and residents declare it online through Hubei health code confirmation registration system, and compare it with the relevant data of COVID-19 epidemic situation in our city to generate personal QR code. As an electronic certificate of personal health information, QR code will be fully used in the next government service, public travel and employment return. The city's health code adopts the system of "one person, one code, one code, flow check, dynamic and effective".