In order to improve the efficiency of nucleic acid collection, the elderly or children who don't have health codes are required to apply for static codes of electronic health cards in advance, download them to mobile phone photo albums for storage or print them out and carry them with them. When making nucleic acids, show pictures or print paper versions for travel. Static code can only be used to confirm identity, even if someone finds out, they can't spy on your health information, and privacy and property security are guaranteed.