The main difference between scanning code and presenting health code is that the function and the object of execution are different: applying for my health code pass code through presenting code function, and providing personal health certificate for epidemic prevention. The other is to scan the health pass code through the code scanning function to obtain the epidemic prevention health information of others as a verification tool for the code holder's health certificate. Health code covers the functions closer to real life applications such as relatives binding, and solves the problems of reporting and traveling epidemic prevention information for the elderly and children.