Asthma prevention and treatment must adhere to the “four early” principles, namely early detection, early diagnosis, early treatment and early prevention. (a) Early detection: to grasp the initiative of asthma prevention and treatment. Asthma can occur at any age, but it is more common in infants and children. Some surveys have shown that 85% of pediatric asthma in children aged 0-14 years started before the age of 5 years, and 75% of those who started within 3 years of age, most of whom developed wheezing symptoms within 1 year after ascending. However, these asthma or wheezing disorders are often overlooked and, because they are not treated appropriately, recurrent attacks even continue into adulthood. Early detection and attention to these wheezing is of paramount importance. Therefore the prevention and control of asthma should start with children, especially infants and young children, and this idea has been incorporated into GINA. (ii) Early diagnosis: Early diagnosis is a prerequisite for early treatment. Some people divide asthma into three stages: early stage, late stage, and persistent asthma. If the diagnosis is confirmed in the early asthma stage, the effect of asthma prevention and treatment can be greatly improved. Therefore, regardless of age, those who can exclude other wheezing diseases and meet the diagnostic criteria for asthma should be diagnosed early and treated promptly. (3) Early treatment: Early treatment is necessary after the diagnosis of asthma, especially inhaled hormone therapy is particularly important. Some foreign studies have confirmed that the efficacy of inhaled hormone therapy for those with asthma duration of 2 years is significantly higher than that of inhaled hormone therapy for asthma duration of 2 years. Because early inflammatory changes in the airways are mostly in the reversible stage of functional changes, once the stage of irreversible structural changes in the airways is reached, the therapeutic effect will be greatly reduced, and various complications and even disabilities will occur, which are life-threatening, therefore, early treatment is necessary. (iv) Early prevention: The principle of prevention and treatment of asthma is the same as that of other diseases, combining prevention and treatment with prevention. It is best to prevent asthma attacks by various methods, such as improving the environment, improving allergies, and actively preventing and treating respiratory infections. Once asthma has occurred, it is also important to take active measures to prevent recurrent asthma attacks, which can greatly improve the level of asthma control. By doing the above, the prevalence of asthma will be significantly reduced, and the control rate will be significantly increased.