Go to the hospital for X-ray and CT examination of facial bones, computer analysis, and then make dental casts, measure the proportion of face, and have dental examination. Talk to the dean directly after the test results come out. The dean first confirmed whether mandibular surgery or bimaxillary surgery was needed, then told him whether he could accept the first operation, and finally analyzed the specific operation methods. After the operation is decided, the operation, anesthesia and orthodontics will be further examined. The operation lasted about 2 hours, and he was hospitalized for 4 days and 3 nights after operation. Go back to the hospital for treatment one week after operation and confirm the postoperative repair. The stitches were removed 2 weeks after operation. Simple daily work can be started about 2 weeks after operation, and normal diet needs to be started about 4 weeks after operation. The intermaxillary fixation device needs to be maintained for 2~4 weeks. Four weeks after the operation, put on braces to correct the teeth.