Disposable surgical masks are usually recommended to be worn for no more than 4 hours, after which the protective capacity decreases. Disposable surgical mask is a common medical protective gear, usually used for epidemic general protection. Usually, it can be used for protection against epidemics, doctor’s examination, etc., the ordinary application of disposable surgical masks, most of the viruses and bacteria can be filtered, it is recommended that the use of disposable surgical masks in the clinic should not be more than 4 hours. Disposable surgical masks are divided into three layers, the outermost layer is the anti-fleakage layer, the middle layer is the filtration layer, and the inner layer is the moisture absorption layer. Disposable surgical masks, wear more than 4 hours, the mask may be contaminated by secretions or moisture, resulting in a reduction in the role of this time should be replaced. In the purchase of disposable surgical masks, should choose the regular manufacturers, to avoid the purchase of poor quality masks and infected diseases.