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目的：应用口腔锥形束CT （CBCT）和Dolphin软件测量上颌发育不足青少年上气道的三维形态，分析上颌发育不足青少年与正常组青少年上气道的三维形态的差异，为临床评估上颌发育不足青少年上气道的三维形态提供一定理论依据。方法选取2013年1月至2015年8月于贵阳市口腔医院正畸科就诊的患者40例，拍摄头颅侧位片，根据SNA、SNB大小将患者分成两组：颌骨正常组和上颌骨发育不足组，每组20例。均拍摄CBCT，用Dolphin软件测量正中矢状面上硬腭平面（HP），软腭下缘平面（SP）及会厌顶平面（TE）的矢状径、冠状径、横截面积，各段体积及总体积，比较颌骨正常组和上颌骨发育不足组上气道的差异。结果上颌发育不足患者上气道的硬腭平面（HP），软腭下缘平面（SP）的失状径、冠状径及横截面积，鼻咽、腭咽段体积，总体积的测量值小于颌骨正常组的测量值，而舌咽段两组测量值无显著性差异。结论上颌骨发育不足患者上气道的鼻咽段、腭咽段较正常人群狭窄，因此纠正上颌发育不足对改善上气道狭窄有积极影响。“,”ObjectiveTo measure the three-dimensional shape of the upper airway in patients with cone-beam computed tomography CT (CBCT) and Dolphin software,and to analyze the three-dimensional shape of the upper airway.Methods 40 patients were selected,and patients were randomly divided into two groups:the normal group and the maxillary development dysplasia group, with 20 cases in each group.All shooting CBCT,dolphin software measurement of the median sagittal plane on the hard palate plane (HP),the soft palate edge plane (SP) and the epiglottis top (TE) plane of the sagittal and coronal diameter diameter,cross-sectional area,the segment volume and the total volume, jaw normal group and maxillary hypoplasia group gas difference.Results The development of maxillary deficiency in patients with upper airway of the hard palate plane (HP),the soft palate margin (SP) plane of the sagittal diameter,coronary diameter and cross-sectional area,nasopharynx,palatal pharyngeal segment volume, total volume measurement value less than the value of the measurement of the jaws of the normal group,and glossopharyngeum region of the two groups of measured value there is no significant difference.Conclusion The maxillary and mandibular segments of the upper and lower jaw are narrow, and the development of maxillary deficiency is a positive influence on the improvement of the upper airway stenosis.