由于儿童的不合作、难配合，使传统的肺功能测定对儿童哮喘肺功能改变和监测因缺乏准确性而失去临床意义，特别是对婴幼儿哮喘，更难获得有意义的肺功能指标。脉冲振荡技术（ＩＯＳ）是近年来发展的新技术。郑永克等［１］报道ＩＯＳ对成人小气道病变有诊断意义。为了探讨... Due to the uncooperative cooperation of children, traditional pulmonary function tests have no clinical significance for the lack of accuracy in the monitoring and monitoring of lung function in children with asthma, especially for infants and young children, it is more difficult to obtain meaningful pulmonary function indexes. Pulse Oscillator Technology (IOS) is a new technology developed in recent years. Zheng Yongk et al [1] reported that IOS diagnosis of adult small airway disease. In order to explore ...