Cranial repair is a very important thing, and it is an important measure to repair cranial defects caused by many reasons, which are not easy to find in normal times, but become more and more serious. Cranial defect is 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 accident, fall from height, cranial surgery, etc.). Skull defect can bring serious harm, the lack of hard shell protection, intracranial tissue will be vulnerable to external direct injury; In addition, the lack of a part of the skull, the destruction of the closed cranial environment, intracranial pressure instability, intracranial blood circulation, cerebrospinal fluid circulation, etc. are affected, can lead to a series of neurological deficits; skull shape incomplete, will also cause psychological trauma to patients, autism, low self-esteem, and even some patients have a series of neurological deficits, Low self-esteem, and even depressive tendencies in some patients, or even anorexia. Once skull defect occurs, skull repair should be carried out in time to solve the problems of no effective protection of brain tissue, blood supply disorder and abnormal cerebrospinal fluid circulation in the defective area, to repair the intact skull shape and restore the patient’s self-confidence. Generally speaking, cranial defect should be repaired within 3 months, so as to restore health as soon as possible. For the material of skull repair, most hospitals still use titanium mesh as the repair material. According to the post-operative response of clinical patients, titanium mesh not only has post-operative exposure, but also because it is a metal material, patients are easy to be sensitive to hot and cold stimulation after surgery, and the subcutaneous tissues are easy to produce or store fluid easily to be infected, and local discomfort or chronic pain may occur in the lesion. For example, the temporal fossa, eyebrow frame and other special parts of the repair after the appearance of poor results, etc.. With the unremitting efforts and exploration of medical experts, a new high-tech material can well meet the basic requirements of patients for cranial repair, the material is polyether ether ketone PEEK material, PEEK material has the advantages of high temperature resistance, corrosion resistance, ray permeable, can be complex shaping, and postoperative can well avoid the complications of titanium mesh and other materials, so that many patients in the postoperative can be better This allows many patients to recover better after surgery.