Orthognathic surgery is a discipline that uses surgery and orthodontics together to treat dental and maxillofacial deformities. It integrates the new theories and technologies of oral and maxillofacial surgery, orthodontics, oral anatomy and physiology, anesthesiology, facial aesthetics and psychology and other related disciplines, especially the combination of surgery and orthodontics, which can The combination of surgical and orthodontic techniques can achieve satisfactory functional and morphological results that are difficult to achieve with surgery or orthodontic treatment alone. The growth of the face is relatively slow and long-lasting, and its growth depends on the stimulation of the neighboring soft tissues and the jawbone’s own functional activities, and the abnormalities of these functional activities will affect the growth and development trend of the jaw and face, thus leading to the occurrence of malformation. Dental and maxillofacial malformations can be divided into two categories: developmental and acquired. Acquired malformations are facial deformities or tissue defects caused by trauma or other external factors; developmental malformations, on the other hand, are due to abnormal growth and development of the facial skeleton, and the main target of orthognathic surgical treatment is developmental dental and maxillofacial malformations. Dental and maxillofacial malformations can be divided into: abnormal anterior-posterior jaw development, such as maxillary protrusion, maxillary recession, mandibular protrusion, mandibular recession, etc.; abnormal vertical jaw development, such as open and closed, long face syndrome, short face syndrome, etc.; abnormal horizontal jaw development, such as wide face deformity, bite hypertrophy, mandibular angle hypertrophy, etc.; chin deformity, such as chin underdevelopment or overdevelopment; facial asymmetric deformity, such as hemifacial short deformity, Unilateral jaw overdevelopment, hemifacial jaw angle hypertrophy, progressive hemifacial atrophy deformity, etc.