ＯＳＡＳ患者睡眠期间体位变化能影响软组织姿势位，并通过重力影响上气道，本研究通过对ＯＳＡＳ患者直立位和仰卧的Ｘ线头影测量结果的分析比较表明：仰卧位趋于使上气道变窄，尤其是软腭后气道间隙减小；舌骨及会厌谷位置明显前移；舌背位置升高，舌背与硬软腭之间空隙减小；舌面积占上下颌间隙的比例增大，即舌和／或软腭与气道之间的大小比例异常在仰卧位更趋严重。此与临床现象相吻合，即多数鼾症或ＯＳＡＳ患者其症状在仰卧位较侧卧位明显。不同个体间上气道及周围结构受体位影响的部位和程度不同 OSAS patients during sleep position changes can affect the position of soft tissue posture, and the gravity impact on the upper airway, the study of OSAS patients by orthostatic and supine X-ray Cephalometric analysis showed that: supine position tends to make the upper airway changes Narrow, especially the soft palate after the airway clearance decreased; hyoid and epiglottis valley position significantly forward; tongue back position increased, the gap between the tongue and the hard and soft palate reduced; tongue area accounted for the ratio of upper and lower jaw space increased, That abnormalities in the size ratio between the tongue and / or the soft palate and the airway become more serious in the supine position. This is consistent with the clinical phenomenon, that is, most patients with snoring or OSAS symptoms in the supine position more obvious than the lateral position. Different individuals on the airway and surrounding structures affected by the body position and extent of the site