At present, there are many people because of an accident, resulting in traumatic brain need to perform craniotomy, and in the craniotomy hand to remove the bone flap after the surgery, some patients have cranial bone defect problem. Cranial defects have a great impact on health, because the skull is an important umbrella for the brain tissue, once the skull is defective, the brain tissue lacks protection, and it is easy to suffer from external aggression. After a skull defect, it is very necessary to have a skull repair surgery, but patients should seize the time to repair, so that the recovery will be better. Generally speaking, if the patient is suffering from cranial hypertension caused by decompression surgery of the large bone flap, the patient must do the cranial bone repair surgery after 3 months after the surgery, which is a better time. Cranial bone repair, material is very important However, in addition to finding the right time to do cranial bone repair surgery, cranial bone repair material selection is also very critical, the material is good directly affect the success or failure of the operation. From ancient times to the present, there are a lot of materials used to do cranial bone repair, such as bone cement, animal bone and so on, but because of the existence of all kinds of defects, has long been eliminated out of the game. And now most of the hospitals are using titanium mesh materials, titanium mesh and traditional materials compared to the progress of many, but there are some inevitable problems, patients should also be careful to choose. New polyether ether ketone PEEK material with excellent performance According to the survey, the ideal material for cranial bone repair surgery is polyether ether ketone PEEK material, which is an advanced polymer material, better than titanium mesh material, and its various properties are excellent, and even comparable to the autologous cranial bone, and choosing this material to do cranial bone repair surgery is no better.