"Location code" is a proprietary two-dimensional code used by people to enter key locations, and it is an independent identification code of Hunan residents' health code in relevant locations. Site managers can download, apply for and post at designated locations through the official account of Hunan Resident Health Card WeChat or the site code information function of Alipay applet. People who enter the place only need to scan the place code through Alipay and WeChat. The health information of people entering the place will be automatically verified in the background of Hunan resident health card system, and the name and location of the place will be marked, so as to realize automatic registration, accurate prevention and control of complicated places of people flow, and at the same time, it is convenient for citizens to travel and realize "one code pass" of people flow.