The pass code is different from the health code. Through the different colors of health codes, we can quickly identify whether a person has passed through provinces and cities with serious epidemic situation, or whether he has directly or indirectly contacted some infected people. Then through the analysis of big data, we can directly lock and find some people who may be infected. This is in the initial stage of epidemic prevention and control, so the practical significance is actually very great.
The function of health code is not to prove that you are healthy, otherwise you are not allowed to declare your physical condition and then report it. It is actually similar to the QR code of an electronic identity. Its function is not only to report personal health, but also to master your action track. For example, entering the supermarket, taking the bus, subway, plane and train will all be required to scan the health green code.