Generally speaking, the standard of pediatric spirometry is 50~70ml/kg, with some variations according to age, gender and weight. Spirometry is the amount of gas that a child can expel from the lungs each time after deep inhalation and exhalation. Generally speaking, the standard of pediatric spirometry is 50~70ml/kg, which can reflect the development of the lungs, and at the same time, it is able to determine whether there are lung diseases, such as restrictive ventilation disorder. Usually as the pediatric age and weight increase, the lung capacity will also increase, the same age, the same weight of the boys will generally be larger than the girls’ lung capacity. Therefore, if the pediatric lung capacity is not within the standard range, it needs to be taken seriously. However, some children do not know how to inhale or exhale deeply, which may affect the results of spirometry. Therefore, it is recommended to retest after a period of rest, and if the values are still abnormal, timely hospitalization is recommended and treatment under doctor’s guidance.