New coronary pneumonia is a disease that can be spread through the air and is contagious. Wearing a mask, washing hands frequently or maintaining social distancing can all help slow the spread of the virus. Wearing a mask can reduce the risk of contracting airborne infectious diseases. Moreover, because the cost of masks is lower, this method can spread to more people. Although masks are a very simple tool, we must also learn to distinguish the types and functions of masks and the precautions for using masks to avoid stepping on minefields.