Health code is a dynamic code updated in time, which can reflect whether a person has been in or out of the high-risk area in the past 14 days, and can also inquire whether there is a recent nucleic acid test report, and also inquire about the vaccination situation, such as vaccination time, vaccination place, what kind of vaccine to use, etc. Therefore, the health code is only taken as a timely voucher for entry and exit inspection, and it will not have any impact on itself.