100 Chinese young men and women with attractive appearance and normal occlusion were the subject of this study. The shape and constructive characteristics of the masseter region and mandibular angles were measured and analyzed by Moire photography. A serial parameters were obtained, which are important in the correction of the deformities of facial asymmetry. A typical case with bilateral hypertrophy of masseters and mandibular angles was reported. The surgery was directed by the results of preoperative Moire photography analysis.