Process: the ascending ramus of mandibular margin is too long, resulting in an angle less than 120, which is seriously at right angles. By cutting off too many "angles", the angle can be returned to 120, and the curve is smooth. The operation time is short. The procedure of face-lifting surgery for hypertrophy of mandibular angle: mainly for hypertrophy of mandible, the ascending branch of mandibular angle (the outer plate of bone) is removed to make the front of mandible look sharp and thin, with the effect of face-lifting and smooth face.