Cranioplasty is a very common and routine procedure in neurosurgery, and is a remedial measure to repair cranial defects caused by various reasons. Cranial defects are a relatively common craniofacial disorder, and every year a large number of people in China suffer from cranial defects due to one reason or another (car accidents, falls from height, cranial surgery, etc.). In addition, the lack of a part of the cranial bone destroys the closed cranial cavity environment, the intracranial pressure is unstable, the intracranial blood circulation and cerebral crest fluid circulation are affected, which can lead to a series of neurological deficits; the incomplete skull shape will also cause psychological trauma to patients, autism, low self-esteem, and some patients even develop low self-esteem, The incomplete skull shape can also cause trauma to the patient’s psyche, self-loathing, low self-esteem, and even depressive tendency in some patients, or even anorexia. Therefore, once cranial defect occurs, cranial repair should be performed in time to solve the problems such as no effective protection of brain tissue in the defective area, blood supply disorder and abnormal cerebral crest fluid circulation, to repair the intact skull shape and restore the patient’s self-confidence. The timing of cranial repair is very important, and some patients ask if they can still have cranial repair after more than a year. Yes, you can. Generally speaking, the skull defect should be repaired within 3 months, and if it has been more than a year, the skull repair should be performed as soon as possible to avoid more adverse symptoms. It is also very important to choose the material for cranial repair. There is a very advanced material called polyether ether ketone, commonly known as PEEK material. This is a special polymer material, its properties are very close to the autologous cranial bone, biocompatible, able to complex shaping, excellent mechanical properties, good protective properties, high postoperative comfort, and gradually become the latest trend in cranial repair materials.