A total of 40 patients with varying degrees of facial skeletal deformity and Class III malocclusion were treated by bimaxillary osteotomy combining maxillo-malar augmentation and/or osseous genioplasty at the same sitting by the author. In all patients, the maxillary advancement and mandibular set back were performed, using Le Fort I maxillary osteotomy and bilateral sagittal split osteotomy of the mandibular rami. In additional bimaxillary osteotomy, simultaneous maxillo-malar augmentation and genioplasty in 20 patients, genioplasty in 12 patients, maxillo-malar augmentation in eight patients, were performed to improve facial harmony. All patients were followed clinically and radiographically for at least 1 year and as much as 5 years after undergoing surgical correction. No cases with relapse or other major complications have been encountered up to now. There were, however, persisting unilateral inferior alveolar nerve damage in two patients, prolonged nerve anesthesia or hypoesthesia in four patients, and short period anesthesia or hypoesthesia in 11 patients, wide alar base in three patients and slight deviation of cartilage septum in two patients. There were no other complications encountered and an unexpected result. The facial skeletal deformity and malocclusion were always treated satisfactorily as patient and plastic surgeon's expectations in one-stage operation, without significant complications and morbiditiy.