Children with underdeveloped jaws can be treated by wearing arch expanding appliances, muscle function training, and orthognathic surgery when necessary after waiting for adulthood, and it is recommended to go to the hospital for specific checkups and corrections. Children can promote the development of the jaw by expanding the arch orthodontic appliances, usually every other day to add force, rotate a circle, the specific situation according to the patient’s condition targeted treatment. Underdeveloped jaws in childhood can also do muscle function training, also wear a functional orthodontic appliances, to achieve certain developmental effects through muscle movement. After correction in childhood, if the jaw is still underdeveloped in adulthood, orthognathic surgery can be performed.