Will not change color. According to the shared data provided by the health department, four categories of people, such as confirmed, suspected, close contact and asymptomatic infected people, will present a &”;concentrated observation&”; red code state. If you have recently been to a high-risk place such as Xinfadi or had close contact with relevant personnel, the health code will show the yellow code status of &”;Home Observation&”; after these personnel are checked and incorporated into community management. The health code is based on the actual real data, which is declared by the citizens or those who rework or return to work online. After background audit, the personal QR code can be generated. The QR code, as a electronic certificate where individuals pass in and out of the local area, can be declared once and used in the whole city. The introduction of &”;Healthy Code&”; aims to make the resumption of work and production more scientific and orderly.