Mandibular angle plastic surgery is now a very mature plastic surgery project and very common. The operation is safe and has no sequelae. What if the mandible is big? Surgical removal of large redundant bone in mandible has no effect on physiological function, and the operation process is carried out under general anesthesia without pain. The operation was performed by oral approach, and the incision was hidden in the mouth, leaving no scar on the face. The recovery of mandibular angle osteotomy is fast, and the swelling can be basically reduced in about a week.