Chinese character face plastic surgery is suitable for square or trapezoidal faces. Osteogenic mandibular angle hypertrophy. The mandibular angle is obviously hypertrophy and eversion, which is an obvious square face or trapezoidal face. Unilateral or bilateral mandibular angle protrusion, bilateral asymmetry. The width ratio of the upper and lower surfaces is not harmonious, and the distance between the two mandibular angles is close to or greater than the width between the two zygomatic processes.