Bronchial asthma, or asthma for short, is the most common chronic respiratory disease of childhood. It is a chronic inflammatory disease of the airways involving multiple cells. This chronic inflammation leads to increased airway reactivity, extensive and variable reversible airflow limitation, and causes recurrent episodes of wheezing, coughing, shortness of breath, and chest tightness, which often flare up or worsen at night and/or early in the morning. Most patients can be treated for remission or remit on their own. Atopic or allergic constitution is strongly associated with the formation of the disease, and most children have a history of infantile eczema, allergic rhinitis, and/or food (drug) allergy. Childhood asthma, if not diagnosed and treated promptly, can produce irreversible airway narrowing and airway remodeling as the disease progresses. Therefore, early management of childhood asthma is critical. The best treatment for asthma is microhormone inhalation therapy, which has a small dosage of hormones and acts directly on the airway mucosa and therefore has few systemic side effects. As long as parents and children adhere to the treatment, asthma can be controlled.