To determine if a baby’s moderate obstruction of pulmonary function is severe, a comprehensive analysis is needed. The first is the severe case, if the moderate obstruction of pulmonary function in children is detected with standardized medication and the child also has dyspnea after activity, it means that the disease is very severe. Secondly, if the moderate obstruction of pulmonary function in children is in the acute phase of respiratory disease, only temporary moderate obstruction of pulmonary function, after the application of bronchodilators most of the children’s pulmonary function can improve quickly, children often also do not have fever and symptoms such as obvious shortness of breath after exercise, this situation is not serious.