The new coronavirus is spread by droplet transmission and contact transmission, to block the discharge of the infected person’s secretions through the mask, or by wearing a mask to block foreign body inhalation, mucosal contact with the virus. General masks are divided into single-use medical masks, medical surgical masks, N95, 3M, and medical ambulance masks, which are suitable for different people. General single-use masks are recommended for use in non-dense public places; medical surgical masks have a higher protective effect than single-use medical masks, and are recommended for suspected cases and service personnel on duty; N95 particle protection masks have a better protective effect and are recommended for use by on-site investigation sampling and testing personnel, and can be worn by public personnel in dense places with high density of personnel or in confined occasions; general medical protection General medical masks are recommended for medical staff in isolation wards of fever clinics and for patients with confirmed illnesses to wear when they are transferred. Different masks have different degrees of protection effect, but all have the same protective effect. General medical masks have three layers, the outermost layer is generally waterproof, the middle has an electrostatic isolation layer that has an adsorption effect on toxic particles or viruses, and the innermost is called the comfort layer, a layer of gauze that protects the skin. You can choose the appropriate mask according to the degree of your condition, the space you are in and your occupation.