Sheng Jiaxin's mandibular angle surgery refers to the principle of fine grinding and cutting after the long curve osteotomy of mandibular angle, and the curved surface is removed to adjust the bone thickness (if the chin is too wide, it will cooperate with the T-bone fracture of the chin). Therefore, compared with the traditional mandibular angle plastic surgery, Sheng Jiaxin's mandibular angle plastic surgery is more suitable for various types of mandibular angles, and the frontal and lateral effects can be maximized.