For some people who can't operate smart phones freely, there are different countermeasures: Shangyu District, Shaoxing, Zhejiang supports replacing health codes with ID cards; Hangzhou has launched the "citizen card+health code" system, which shows the status of health code by swiping the card; Guangdong's "Yuekang Code" can save and print paper health codes, which have the same effect as electronic codes; People who don't have smart phones in Shanghai, Jiangsu and other places can be audited by the community and stamped with the official seal to issue a health pass, valid for 14 days.
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.