The brain is the commander of the human body, which governs all organs and tissues of the body and supports all life activities. This command requires strong protection, which is the outer layer of brain tissue, the skull. Without the protection of this hard shell, the brain tissue and the head and facial organs may be easily damaged, endangering the life and health of the person. Therefore, once a skull defect occurs, it should be repaired promptly. Cranial defect is a relatively common disorder, which can be caused by many reasons in life, such as falling objects, traffic accidents, craniofacial surgery and so on. Accordingly, cranial repair is a relatively routine procedure in modern medical neurosurgery and the technique is very mature. Although it is routine and mature, it is a surgery after all, and it still holds the hearts of patients and their families. Some patients have asked how to maintain the skull after the repair. For this question, it still has a lot to do with the repair material. Choosing a good repair material will be more beneficial to the post-operative recovery. The PEEK material, also known as polyether ether ketone material, has been widely used clinically to achieve a very satisfactory repair effect, with this peek material cranial bone repair basically does not require special maintenance, this PEEK material has excellent mechanical properties, may play a good protective role; tissue compatibility is very good, will not produce rejection reaction. In addition this material elasticity, strength, stability, ray transmission, heat insulation and other aspects of performance are comparable to the autologous cranial bone, is a very good cranial bone replacement material.