Correction of mandibular angle hypertrophy is a kind of facial contour reconstruction surgery, which corrects mandibular angle hypertrophy by surgical osteotomy, bone grinding and masseter muscle resection, and transforms a square or trapezoidal face into an oval face. This surgical technique is difficult, risky, traumatic and has a high incidence of complications. It is a four-level project in the classification of medical beauty projects of the Ministry of Health, and plastic surgery should be carried out in a three-level plastic surgery hospital or a three-level general hospital.