Gansu Province, health travel code system based on communications, transportation and other departments to provide in Gansu to return to Gan Gan personnel data information, Gansu Province, the full population information base, the province's new Crown pneumonia confirmed cases, suspected cases, close contacts, home isolation observation of personnel and cured discharged from the hospital information base, and other data, through the big data comparison, by the background of the system to automatically generate health travel code.