Rapid Prototyping(RP) models in facial asymmetry patients are used mainly for assisting diagnosis, planning treatment. It provides an easy way to measure discrepancies due to asymmetry on the model directly, and opportunity to study the bony structures of the patient and to manipulate them as required before the actual surgery. The purpose of this study was to evaluate the surgical prediction of orthognathic surgery using RP model in facial asymmetry patients. In 26 patients with facial asymmetry, We compared patient' cephalogram and skull posterior-anterior view with RP model after surgery. Surgery methods were sagittal split ramus osteotomy(SSRO), intraoral vertical ramus osteotomy(IVRO), inverted L osteotomy, Le Fort I osteotomy. Difference of two groups was analyzed and compared statistically. The results were no difference between patients and RP model statistically. In surgical methods, IVRO was better similar results than other methods. RP model is useful in selection of surgery method and prediction of surgery. In facial asymmetry, we knew that IVRO in mandibular surgery is better method than others.