A healthy and happy child is a parent’s greatest wish, but accidents happen all the time. In the hospital, we encounter many children who are just a few years old with serious skull defects due to head injuries caused by falls from height and traffic accidents. The skull can play a protective role for the brain tissues and is an important protective barrier for the brain, after the child’s skull defect, the brain tissues are easily affected by the outside world, which can lead to a series of problems. So, what is the best age for a child to have a skull defect repaired? Medical experts all over the world have conducted a lot of research and intense discussion on this issue. After relevant experiments, medical experts have proved that the risk of surgery at different periods of children’s growth and development is related to the growth rate of the skull, and children are in the rapid growth period of the skull from 0 to 3 years old, and after 3 years old, the growth rate is relatively slow, and the risk of repair is smaller at this time. The medical recommendation, based on the explanations of many experts, is that a child can undergo cranial repair surgery at the age of three or older. Although skull repair surgery is a very mature surgical procedure, children’s skull will continue to grow afterwards, so the material for skull repair must be carefully chosen. Currently, there is a new polymer material used as the implant material for skull repair, namely polyether ether ketone – PEEK material, PEEK material and autologous bone properties, its hardness, elasticity, insulation, stability are very close to the human skull, can be well adapted to the growth of children’s autologous bone, and PEEK is the material of choice for children’s cranial repair because of its strong shaping ability, which makes the repair of children’s skulls aesthetically pleasing.