Cranio-maxillofacial cosmetic surgery mainly refers to all kinds of operations to change the face shape, such as high cheekbone reduction surgery, mandibular angle hypertrophy surgery (square face becomes oval face), chin horizontal osteotomy forward surgery (small chin correction) and so on. These operations are very delicate, requiring sophisticated surgical instruments, and the operators must have the same artistic aesthetics and first-class surgical techniques as sculptors.