The skull is the hardest bone in the human body and also one of the most important. The role of the skull in the human body is important, because he is the direct protective barrier of the human brain, protecting the brain tissue and intracranial organs from external damage, while maintaining a normal and stable intracranial environment, to ensure the operation of intracranial life activities. However, the skull is always facing the threat of various external risk factors and injury, many people because of such and such reasons and lead to cranial defects, cranial collapse, the appearance of extremely unattractive, but also cause a lot of neurological damage. So what are the precautions for cranial defects? Patients with cranial defects should pay attention to the fact that the defective area does not have effective protection for brain tissues, and brain tissues are easy to be injured, so they should pay attention to the protection in their daily life, and in addition, cranial defects may lead to blood supply disorders, cerebrospinal fluid circulation abnormalities and other problems. Therefore, the most important thing that patients need to pay attention to is to have the repair surgery in time, generally 3 months after the defect is suitable for repair. One of the most important aspects of cranial repair surgery is the selection of a good repair material. Polyetheretherketone PEEK, which is widely used by our team, is currently a more advanced and ideal material for cranial bone repair. There is a person from Ninghua who suffered from a skull defect due to a traffic accident, and he received this advanced PEEK material for his skull repair, and achieved a very satisfactory result. This PEEK material is three-dimensional molding, 3D printing, can be tightly anastomosis in the bone window, highly restore the physiological structure of the skull, in addition to the PEEK material in the elasticity, strength, stability and other aspects of the performance of the human skull are comparable to that of the skull, become the latest trend of cranial bone repair materials.