The well-defined chin is one of the features of the craniofacial structure that has developed over the course of human evolution. The chin, like the nose, occupies a prominent position on the face and must be considered and evaluated in any plastic surgery plan to alter the facial contour. Abnormal chin morphology without dental malocclusion is a common problem in cosmetic plastic surgery. We developed a corresponding surgical plan based on the classification of such chin deformities by McCarthy, an American plastic surgery authority. Now introduced as follows: a. Simple small chin: ① chin sagittal diameter reduction: chin horizontal osteotomy sliding osteotomy ( horizontal advancement sliding osteotomy). The plane of osteotomy is parallel to the plane of dental coaptation, preserving the subchin muscle attachment and blood supply; ② reduction of chin pendant diameter or simultaneous reduction of sagittal diameter and pendant diameter: interposition augmentation osteotomy is used. Horizontal or oblique interception of the chin bone segment, moving forward and downward, osteotomy gap bone grafting, titanium plate solid fixation. Second, simple giant chin chin sagittal diameter or vertical diameter increase: preferred wedge osteotomy (wedge ostectomy): in the middle of the chin, a wedge-shaped bone section is removed, the chin bone section is moved upward to close the gap left after the osteotomy, shorten the chin height and sagittal diameter value, and the titanium plate is firmly fixed. Third, sagittal axis shortening and vertical oversized mild deformity available oblique osteotomy (oblique osteotomy): generally more jumping osteotomy chin shaping (jumping genioplasty), which is characterized by cutting off the chin bone segment with its attached supraglottis muscle below together with forward and upward movement, so that the back of the bone segment attached to the front of the mandibular median joint bone The titanium plate screw fixation increases the sagittal axial chin prominence while reducing the vertical chin height. Fourth, the horizontal asymmetry on both sides of the horizontal direction was treated with horizontal osteotomy and horizontal movement of the chin bone segment, so that the apex of the chin was moved into the median sagittal plane. Fifth, asymmetry in both horizontal and vertical directions is more complicated, the surgery requires interception of the top part of the chin and the middle part of the two bone segments, the middle cuneiform bone segment is 180° flipped and then interpositioned and replanted, the top part of the chin bone segment is moved horizontally and vertically to close the osteotomy gap, so that the chin apex is centered and the titanium plate is firmly fixed. Chinplasty can also be used in combination with other cosmetic plastic surgery. Based on the experience of 50 cases of chin osteotomy and cheek cosmetic surgery performed at the same time in the past 20 years, it is suggested that the advantage of the combined surgery is that the anterior migration of the chin and supraglottis muscle group not only obtains a well-formed and well-defined chin and jaw and neck angle, but also eliminates the sagging of the skin and soft tissues of the neck and enhances the cosmetic effect of SMAS tightening of the face and neck.