Objective: To compare the morphological changes of velopharyngeal components in cleft lip and palate patients after maxillary advancement who underwent conventional modified Le Fort I osteotomy or transpalate modified Le Fort I osteotomy to correct maxillary hypoplasia.Method: 21 subjects were operated at Peking University School of Stomatology between2012-2013.They were randomized into transpalatal modified Le Fort I osteotomy or conventional modified Le Fort I osteotomy groups.Their mean age at the time of operation was 20.7 years (range 18.2-27.6).The osteotomy was fixed with titanium plates and the osteotomy line was bone-grafted.2 patients with preexisting pharyngeal flap were considered outliers.The Lateral cephalometric radiographs with velum at rest and during phonation of/i/were undertaken preoperatively (T1) and at least 6 months postoperatively (T2).Some measure indexes of velopharyngeal configuration were collected and analyzed.