Bronchiolitis refers to inflammation of the bronchi. The most common and serious form of bronchiolitis in children is capillary bronchiolitis, which occurs in winter and can cause localized epidemics. Capillary bronchitis is usually a complication of viral infections such as the common cold, influenza, or bacterial infections and is a common acute lower respiratory tract infection in children. The disease occurs mostly in children under 2.5 years of age, 80% within 1 year of age, and mostly in children under 6 months of age. Prevention of capillary bronchitis should be done: 1. Ensure fresh indoor air and avoid convective winds. Room temperature 18℃-22℃, humidity 55%-60% is appropriate. Daily ventilation, winter and early spring weather changes, pay attention to warmth, should not use air conditioning. 2.Keep quiet and get enough sleep. 3.Eat more easily digestible, high-calorie, vitamin-rich food. 4. Avoid visiting children with respiratory tract infections, avoid carrying children into crowded public places, parents of patients pay attention to their own cleanliness and hygiene, and disinfect children’s dishes by boiling 1-2 times daily to prevent diarrhea from occurring.