Abstract: Objective To investigate the differences of the upper airway morphology and the hyoid position among nonsnorig youths with different sagittal skeletal patterns． Methods 90 nonsnoing youths with malocclusion were divided into three groups based on their ANB angles:class Ⅰ group,class Ⅱ group and class Ⅲ group. CBCT scans were performed on all patients in natural head posture. Dolphin Imaging 11.0 was used for threedimensional reconstruction.The anteroposterior (AP) and lateral (LAT)dimensions,crosssectional areas(CSA) of retropalatal region and retroglossal region,airway volume(AV),minimum axial area(MAA),and length of airway were measured.Cephalometric radiographs and the position of the hyoid bone were analyzed with Winceph 7.0. All data were statistically analyzed and evaluated. Results RPCSA、RGCSA were smaller in classⅠand class Ⅱ group than in class Ⅲ group. RGL AT,RGAP,AV and the position of the hyoid were statistically different between Class Ⅱand ClassⅢ group(P<0.05). Correlations among upper airway morphology,hyoid position,and head posture were confirmed. Conclusions Differences in the upper airway morphology and hyoid position are statistically significant among the three groups. The upper airway morphology and the hyoid position of nonsnoring youths with malocclusion can be affected by the sagittal skeletal patterns.