Medical surgical masks: generally made of non-woven material, including the filter layer, mask belt and nose clip. The standard medical surgical mask is divided into 3 layers, the outer layer has a water barrier to prevent droplets from entering the mask; the middle layer has a filtering effect and can block >90% of 5μm particles; the inner layer near the mouth and nose is used to absorb moisture. In daily life, it can be used to prevent the spread of influenza, respiratory system and other infectious diseases. (1) General population: It is recommended that the general public, public transportation drivers, cab drivers, sanitation workers, public place service personnel, etc. wear masks while on duty, and it is recommended that medical surgical masks be used, and medical protective masks can be worn if conditions and physical condition allow. (2) Special populations: High-risk populations who may be exposed to suspected or confirmed cases are recommended to wear medical protective masks (N95 or above) and goggles in principle. Patients with certain cardiopulmonary diseases should consult a medical professional before wearing the mask and choose a suitable mask under the guidance of the medical professional.