Delta virus is a novel coronavirus mutant strain with a high viral load and more infectious and pathogenic than the novel coronavirus. It can be spread through various ways, mainly including droplet transmission, aerosol transmission, contact transmission, etc. 1, droplet transmission: the infected person when talking, sneezing droplet contains a large number of delta virus, if the healthy people are exposed to, it can greatly increase the chance of infection; 2, aerosol transmission: also known as airborne transmission, refers to the droplet in the air suspension process through the gas medium dispersion, thus forming The form of aerosol floating to a distance, resulting in long-distance transmission. There is a large amount of delta virus in the indoor air where the infected person exists, and if the person is in the same indoor environment as the infected person, the chance of infection is higher; 3. Contact transmission: contact with pollutants discharged by the infected person, such as urine and feces, which contain a large amount of delta virus, may lead to infection if healthy people come into contact with the pollutants, or come into contact with contaminated objects. Therefore, it is recommended to gather less, wear proper masks that meet epidemic prevention standards when going out and change them regularly, and keep a certain distance from people when talking to them. Daily life should also pay attention to frequent hand washing, ventilation and disinfection to help reduce the chance of delta virus transmission and infection.