The "health code" is based on real data and can be generated by citizens or people who have returned to work through their own online declaration and background audit. As an individual entering and leaving electronic certificate locally, the QR code can be declared once, which is universal in the whole city.

The national government service platform "Epidemic Prevention Health Code" integrates the relevant information of "Communication Big Data Travel Card", which can show whether the user has been to medium and high-risk areas and other travel information in the health code, and help the health code "one code pass". On April 6, when introducing the results of the meeting between the foreign ministers of China and South Korea, Zhao, a spokesperson of the Ministry of Foreign Affairs, said that both sides supported the inclusion of each other's citizens in their own countries in the scope of vaccination through consultation and the establishment of a mutual recognition mechanism for health codes.