The new coronavirus pneumonia epidemic is serious, public places need to wear the correct mask, the method is as follows: 1, before wearing the mask should wash their hands, pay attention to hand drying after washing their hands, do not get the mask wet. 2, wear the mask process to avoid hand contact with the inner surface of the mask, to reduce the possibility of contamination of the mask. 3, distinguish the inside and outside of the mask, up and down, generally light-colored side is the inner surface, the inner surface should be close to the mouth and nose, dark-colored side outward; there is a metal strip (nose clip) end of the mask. 4, the mask should be replaced regularly, not inside and outside wear the opposite, not to wear two sides in turn. Non-functional masks include paper masks, cotton masks, sponge masks, activated carbon masks. Medical surgical masks are required to prevent respiratory infections to a certain extent. The outer packaging clearly indicates medical surgical N95 masks to prevent droplet infection caused by patients’ body fluids, filter efficiency of 95%, and try to choose masks without breathing valves. Precautions: Replacement time: It is recommended that disposable masks should be replaced every 2-4 hours, and once contaminated, they should be replaced at the first time. Storage method: Put the mask into a clean self-sealing bag and fold the side that touches the mouth and nose inward.