Bronchial asthma (asthma for short) is a chronic inflammatory disease of the airways involving a variety of cells such as mast cells, lymphocytes and eosinophils and a variety of cellular components such as cytokines and inflammatory mediators. It is characterized by recurrent attacks of cough, chest tightness, shortness of breath, and wheezing. Currently, long-term inhaled adrenal glucocorticosteroids (inhaled hormones) at different doses are the main measure to control mild to severe persistent asthma, depending on the condition. However, the mention of “hormones” causes fear in many patients, who believe that they have obvious side effects, such as obesity, acne, and feminization, just like oral or intravenous hormones. Some patients lack the most basic understanding of inhaled hormone, and even think it is an asthma calming drug, and only apply it when they have an asthma attack; some refuse to apply it because it cannot calm asthma. Since 1972, when glucocorticoid inhalation therapy was first used in the UK, glucocorticoid inhalation therapy has become the most effective and safest first-line therapy recommended by the World Health Organization and the Global Initiative for Asthma Control (GINA) expert committee for asthma control. The key to the importance of inhaled hormone therapy in the treatment strategy of asthma is that it has several advantages: First, inhaled therapy is the best method of drug delivery for the treatment of asthma. Inhalation therapy is a method of treating asthma by inhaling a drug in the form of an aerosol through the respiratory tract. The site of asthma patients is the bronchus, inhalation therapy can make the prevention and control of asthma drugs directly to the lesion, quickly play a therapeutic role. The effect is fast and effective. Secondly, these drugs have strong local anti-inflammatory effect, good selectivity and high activity in the airways, etc. Administered through the inhalation process, the drugs act directly on the airways and require smaller doses. Finally, glucocorticoids (e.g. prednisone, hydrocortisone, etc.) have more systemic side effects when administered orally or intravenously and are not suitable for long-term application. Inhaled formulations are different, because they are administered locally and enter the bloodstream mainly through the gastrointestinal and respiratory tracts, and most of the drugs are inactivated by the liver, so the systemic side effects are relatively small. Local adverse effects of inhaled glucocorticosteroids mainly include oral mycobacterial infections and hoarseness. In order to reduce these adverse reactions, on the one hand, the lowest effective dose that can control asthma should be inhaled; on the other hand, the inhalation device should be equipped with a large-capacity nebulizer to reduce the deposition of drugs in the mouth and throat, thus reducing the absorption of glucocorticoids from the gastrointestinal tract; finally, rinsing the mouth in time after each inhalation of glucocorticoids can spit out the residual deposits in the mouth and throat with mouthwash, which can also greatly This can also greatly reduce the adverse effects. In summary, the use of inhaled hormones in asthma treatment is not terrible. Inhalation therapy is a local drug, with small dose, direct action on target organs, fast onset of action, few systemic adverse effects, non-invasive and painless, and easy to use, especially suitable for the prevention and treatment of asthma in children.