The best time for cleft lip surgery is 3 months after birth, and cleft palate repair is mostly performed at the age of 12 ~ 18 months. Cleft palate repair makes children form a good velopharyngeal closure, which creates good conditions for good pronunciation; After cleft lip repair, there are often different degrees of nasal deformity, that is, flat nostrils, collapse, crooked nose and so on. And nasal deformities should be corrected at the age of 8. In addition, children with cleft lip and palate often have malocclusion of maxillary teeth, which means "covering the sky on the ground". Orthodontic treatment should be performed at the age of 12.