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Orthognathic surgery was performed on 362 patients from 1987 to 1997 at the Second Department of Oral and Maxillofacial Surgery, Osaka Dental University.The results were as follows: 1. The male-female ratio was 1: 2.4.2. The mean age was 22.4 years old.3. The diagnosis of mandibular prognathism was made for most of the patients (89.2%).4. Sagittal splitting ramus osteotomy (SSRO) was performed on 274 cases (75.7%).5. The mean time of operation for SSRO was 3hr. 7 min±57min, and for mandibular body osteotomy was 3hr. 15min±60.7min.6. The mean blood loss during operation for SSRO was 275.8±221.4ml and for mandibular body osteotomy was 171.8±147.5ml.7. Paresthesia of the lip and mental area was observed in 404 sides after opration. 80.7% of patients treated for SSRO recovered within a year.8. TMJ were examined in 202 cases for 1 year after SSRO. The symptom of TMJ was recognized in 5 cases.