Tuberculosis can transmit pathogens through droplets as well as through sputum. Mycobacterium tuberculosis can be detected in the sputum of some patients with tuberculosis, and the pathogens in dried sputum can survive for 6-8 months, so the sputum of patients with tuberculosis should be treated with special disinfection. When coughing, sneezing, talking, laughing or singing, microdroplets of Mycobacterium tuberculosis can be dispersed into the air and can survive for several hours, and can also be attached to dust and objects, so there is a risk of infection when inhaled by others. Therefore, it is important to keep a certain distance from TB patients and wearing a mask is an effective measure to stop TB transmission.