New Crown Pneumonia Epidemic Prevention and Control Command was informed that the big data epidemic text messages are sent according to the cell phone number, is the phenomenon of temporal and spatial accompaniment. The relevant person in charge of the city is currently carrying out further flow of investigation work, the use of big data, "Internet +" and other technical means of screening relevant people, such as the public's phone number and the number of confirmed cases had been in the same spatio-temporal grid (range is 800 meters × 800 meters) **** with the same stay for a period of time, you will receive epidemic prevention and control reminder SMS.