Abstract: 【Abstract】 Objective To analyze the skeletal and dental characters between subjects with Class III malocclusions and subjects with normal occlusions by using cone-beam computed tomography. Methods 21 subjects with Class III malocclusions and 20subjects with normal occlusions were assessed with cone-beam computed tomography scans. And the CT images were constructed into 3D model by using medical image processing software Dolphin Imaging 11.0.Anatomical landmarks were located and reference planes were established on the 3D model. The measurements were analyzed by SPSS 17.0. Results The extent of maxillofacial deformity increases from top to bottom in adults with facial asymmetry. Some measurements of Class III malocclusions were found to be different with normal occlusions including Asymmetry index of Orbitale ，Anterior nasal spine and Menton.Conclusions Based on this study, the discrepant jaw growth resulting in a Class III skeletal pattern results in no more skeletal asymmetry than Class I skeletal patterns.

Key words: cone-beam computed tomography, facial asymmetry, Class III malocclusions