Chinese character face, also called square face, can be divided into rectangular face and short square face. The formation of a square face is mainly due to the hypertrophy of the mandibular angle on the side of the mandible. The plastic face-lifting surgery for the hypertrophy of the mandible is mainly aimed at grinding off the outer plate of the ascending branch of the mandibular angle, so that the mandible with a wide front view becomes sharp and thin, with the effect of face-lifting and smooth face.