This article describes a case we experienced in which good postsurgical facial profiles were obtained for a patient with jaw deformities associated with facial asymmetry,by implementing surgical planning with SimPlant OMS.Using this method,we conducted LF1 osteotomy,intraoral vertical ramus osteotomy(IVRO),sagittal split ramus osteotomy(SSRO),mandibular constriction and mandibular border genioplasty.Not only did we obtain a class I occlusal relationship,but the complicated surgery also improved the asymmetry of the frontal view,as well as of the profile view,of the patient.The virtual operation using three-dimensional computed tomography(3D-CT)could be especially useful for the treatment of patients with jaw deformities associated with facial asymmetry. This article describes a case we experienced in which good patienturgical facial profiles were obtained for a patient with jaw deformities associated with facial asymmetry, by implementing surgical planning with Simlant OMS. Using this method, we conducted LF1 osteotomy, intraoral vertical ramus osteotomy (IVRO) , sagittal split ramus osteotomy (SSRO), mandibular constriction and mandibular border genioplasty. Not only did we obtained a class I occlusal relationship, but the complicated surgery also improved the asymmetry of the frontal view, as well as of the profile view, of the patient. The virtual operation using three-dimensional computed tomography (3D-CT) could be particularly useful for the treatment of patients with jaw deformities associated with facial asymmetry.