The health code is displayed as red team, and will automatically change to green code 14 days after the centralized isolation or home isolation medical observation management is completed. During the isolation period, the isolation can be lifted after the nucleic acid double collection and double test are negative. In other words, as long as the red code of the health code is detected many times and the result is negative, it will be cancelled and adjusted to the green code. At present, there are three kinds of health codes: green, yellow and red. According to the regulations, red team personnel need to take isolated observation measures.