Yunnan health code adopts "green code, yellow code and red code" three-color dynamic management. Green code access; The yellow code is included in the grid unit management, and it is observed at home 14 days; Red code isolation 14 days, nucleic acid detection twice at your own expense. Special circumstances require isolation in designated hospitals. The "health code" is based on real data and can be generated by citizens or people who have returned to work through their own 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.