Have you ever seen a half-head man? In some science fiction movies there may be the image of a half-head man, in fact, there are such people in our lives, which are patients with cranial defects. Cranial defects are not rare, and we often encounter such patients in our neurosurgical clinical work. In recent years, due to the frequent occurrence of traffic accidents, production safety accidents and various cranio-cerebral surgery, many cases may be left with the problem of cranial defects. Cranial defects will cause certain harm to the human body, such as a series of cranial defect syndrome, such as headache, dizziness, speech impediment, emotional instability, temper, irritability, and so on, and some patients will produce a certain degree of psychological disorders, depression and low self-esteem tendency, and so on, the harm is still more serious. Therefore, it is generally recommended that cranial defects with a diameter of more than three centimeters require timely cranial bone repair surgery. Then mentioned cranial bone repair surgery, cranial bone repair material is a more important influence factors. Some patients ask if the silicone gel for cranial bone repair is valid. Cranial bone repair surgery is a relatively old and classic surgical procedure, cranial bone repair materials have undergone constant iteration and renewal, clinical used to use a variety of materials, such as laminating cloth sheet, metal sheet, animal bone, autologous bone, silicone, acrylic, calcium phosphate bone cement, etc., but these materials are because of a variety of problems, most of them have been eliminated, including the silicone material, the current clinical has been No longer used in clinical practice. At present, there are two mainstream cranial bone repair materials used in clinical practice, one is titanium mesh material, and the other is polyether ether ketone peek material. Comparatively speaking, the performance of peek material is more excellent, comparable to the human body’s autologous skull, high comfort, good aesthetics, strong protection, and has become the new trend of cranial bone repair materials. At present, our team is widely using this advanced polyetheretherketone peek as cranial bone repair material, and constantly improve the technology innovation and material optimization design, comprehensive carry out peek cranial bone repair plastic surgery, can achieve good repair effect.