Prevention of cough variant asthma includes the following aspects: 1. Avoid contact with allergens, there are more allergens now, because our country is now more rapidly industrialized, so there are many new allergens, such as allergens generated by home decoration, and pet keeping, carpets, including many allergens to avoid contact; 2. Keep your home fully ventilated; 3. Pay attention to home hygiene; 4. Avoid Strenuous exercise, there is a kind of asthma called exercise asthma, and exercise is directly related. It is more common inside many secondary schools, and asthma occurs after strenuous exercise. It is recommended to go to the hospital for testing to detect what they are allergic to, now there are dozens of allergens detected in the hospital, once detected to avoid contact, this is very critical.