Methods: X ray findings of tracheobronchial foreign body in 36 children, and the reasons of its missed diagnosis or misdiagnosis were retrospectively analyzed when compared with the findings by tracheobronchoscopy. 方法:回顾性分析36例小儿气道透X线异物X线诊断,并与气管支气管镜结果对照,分析其误漏诊原因。