Admission code and travel code are both a kind of health code system introduced by the state to realize health management, epidemic prevention measures and travel management. The difference is: 1. Entry code is mainly used for the verification of entering public **** places, such as hotels, scenic spots, exhibition halls, stations, airports and so on. By scanning the code, the health status and nucleic acid test result of an individual can be displayed in order to realize the entry and exit of low-risk personnel. 2. The travel code is mainly used for travel management, such as taking transportation, entering and leaving provinces and cities. By scanning the code, it can show the health status and epidemic situation of an individual in order to realize epidemic control and prevention and control work. Both are real-name health management systems based on technologies such as big data, and cloud computing, aimed at accelerating the resumption of production and industry standardization, while safeguarding public **** security and risk assessment.