The skull plays a very important role in our life. An intact skull contributes to the maintenance of aesthetic appearance, the complete closure of the cranial cavity, the stability of normal intracranial pressure, and the normal functioning of cerebrospinal fluid and cerebral blood. Once a defect occurs in one part of the skull, it can cause many problems to the health and normal life of the patient. One of the obvious hazards of cranial defects is the lack of strong protection for various tissues of the brain, which makes it easy to be exposed to various dangers causing secondary injuries, and from this perspective, patients with cranial defects face greater risks than ordinary people. There is also an incomplete cranial cavity, atmospheric pressure can act on the intracranial tissues, resulting in unstable intracranial pressure and changes in the intracranial environment, then cerebrospinal fluid circulation and cerebral blood circulation may be impaired, easily causing a series of cranial defect syndrome. In addition. Cranial defects also have a great impact on the patient’s appearance and psychological aspects. The collapse or bulging of the defective area makes the original asymmetrical head shape even more unattractive, resulting in a strong sense of inferiority, reluctance to participate in social life, emotional depression and loneliness. Especially children, because of their young age, are not willing to reveal themselves to their parents too much, which is very detrimental to their healthy growth, and even more so, the cranial defect may cause the problem of intellectual decline. Cranial defects should not be taken care of, and timely repair is the first priority. Most neurosurgeons have reached a consensus that a defect of 3 cm or more can be repaired at the earliest possible time, with a very small number of cases depending on the circumstances. The time of cranial repair for children is 3 years old or above, so cranial repair can be done at the age of three. Currently, peek polymer material is used for skull repair. peek material has excellent performance and good shaping effect, so it is the ideal material for skull repair surgery.