1. Mandibular angle plastic surgery through oral approach, leaving no scars on the body surface. 2. The mandibular angle plastic surgery takes a short time, generally only about 60 minutes from the beginning to the completion of the operation, and the postoperative edema is light and the recovery is fast. 3. Different osteotomy and mandibular angle correction methods are adopted according to different face types and mandibular angle types, and the osteotomy is accurate. 4, mandibular angle plastic surgery can be combined with mandibular angle and mandibular angle edge osteotomy, which has a special improvement effect on the big face, long face and square face caused by excessive mandible, making the face smaller and more refined. 5. Intra-oral osteotomy can be combined with the removal of hypertrophic masseter muscle and buccal fat at the same time, and mandibular angle plastic surgery can obviously reduce the face shape. 6. Mandibular deviation or asymmetry can also be corrected by mandibular angle plastic surgery.