Influenza A refers to Influenza A (H1N1). Wearing a mask can prevent Influenza A (H1N1), but it cannot completely avoid infection. Influenza A (H1N1) is an acute respiratory infectious disease caused by the infection of influenza A (H1N1) virus, which is mainly transmitted through droplets via the respiratory tract. If an infected person sneezes, coughs and so on, wearing a mask to a certain extent can effectively block the infected person with the relevant virus particles of the droplets from the respiratory tract into the human body, and there is a certain preventive effect. However, wearing a mask can not completely avoid H1N1 infection, such as due to contact with virus-contaminated items, through the oral cavity, nasal cavity, eyes and other mucous membranes, direct transmission and other ways, may cause infection. Therefore, wearing a mask still carries the risk of being infected. Daily prevention of influenza A (H1N1), in addition to influenza to avoid going to crowded places, go out and wear a mask, but also need to pay attention to personal hygiene habits, wash their hands regularly, do a good job of protection and isolation measures, to avoid contact with the relevant patients, but also through the influenza vaccine, so that the body produces the appropriate antibodies to prevent influenza A (H1N1), thus preventing viral infections. It is recommended that during the influenza A (H1N1) pandemic, the awareness of personal protection should be strengthened and appropriate measures should be taken to reduce the risk of the disease.