Health codes are based on actual 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 introduction of the health code aims to make the work of returning to work more accurate, scientific and orderly.
. The National Development and Reform Commission, together with other departments, issued "Opinions on Strengthening the Prevention and Control of Spring Festival travel rush Epidemic in 20021Spring Festival travel rush", demanding that "health codes" be popularized nationwide during the period of Spring Festival travel rush to avoid gathering due to scanning codes. National Mutual Recognition of Health Codes during 20021Spring Festival travel rush.