The statement that wearing multiple layers of masks can protect against viruses is false. Wearing a mask is mainly to prevent the spread of respiratory viruses, of which the main way to spread respiratory viruses is through droplets or aerosols in this form to spread. Droplet particles are larger, aerosols are generally less than 0.1mm in diameter and can evaporate quickly after exhaling from the body, forming droplet nuclei, which are just a few microns in diameter, so the diameter of aerosols containing viruses in the air is a few microns, which can be prevented by ordinary disposable surgical masks. The disposable surgical mask we commonly use is a layer of dark color is the water barrier layer, and there is a layer of light color in the middle is the moisture absorption layer, and the middle is the filter layer. So with one layer of disposable surgical mask, it can play the role of preventing virus transmission in daily life. If we wear multiple layers of masks, it will not only fail to increase the effect, but also make us feel breathless. Especially for those who have respiratory diseases, it will aggravate his discomfort and even aggravate the attack of his respiratory diseases. Therefore, we just need to wear a layer of disposable surgical masks can be. But we also need to pay attention to wash our hands regularly, avoid gathering groups, and also eat thoroughly disinfected food to prevent the transmission of viruses by other means.