Bronchial dilatation in children is usually an irreversible dilatation with symptoms that can go away, and also is usually not completely curable. Bronchiectasis is an irreversible dilatation due to congenital malformations of the bronchial tubes, or blockage of phlegm in the bronchial tubes after repeated respiratory infections, which destroys the elastic tissue of the wall of the distal bronchial tubes and causes structural changes, and cannot be completely cured even if the symptoms disappear. Children with mild bronchiectasis are less likely to become re-infected and have a good prognosis. Children with severe bronchiectasis may have recurrent and progressive lung infections, and need to be examined immediately in a regular hospital. Once diagnosed, the primary focus should be treated under the guidance of a physician, the infection should be controlled, and appropriate medication should be applied to alleviate the progression of the disease as prescribed by the physician.