Cranial repair surgery is now a relatively routine procedure in neurosurgery, with mature techniques and widespread applications. In fact, it is a relatively long history of surgery, as our ancestors were practicing such surgical medicine thousands of years ago. After thousands of years of development, skull repair is now very mature. During the thousands of years of development, not only the repair techniques have been improving, but the materials used for cranial repair have also undergone many updates and upgrades, and very desirable materials have now become available. In the beginning, ancient doctors might cover the bone window with only a piece of flannel for repair, or some good conditions with metal pieces, but in general, the surgical materials were relatively rough at that time. Later on, materials such as hydroxyapatite, calcium phosphate bone cement, plexiglass, and various metal materials appeared, but all of them were not widely accepted because of one problem or another. In recent years, titanium alloy materials are commonly used in clinical practice for skull repair, and although there has been progress, there are still more problems. Some patients ask how long titanium cranial bone can be used. In fact, the problem of titanium alloy is not how long it can be used, but its durability is fine. However, the biocompatibility of titanium alloy is not very good, and there are cases of rejection and infection, and this metal material is not insulated, which will cause the patient to be sensitive to heat and cold after surgery, and will affect the post-operative medical examination such as CT and MRI. The PEEK material is biocompatible and is not subject to rejection or infection, and the heat insulation is excellent. Moreover, PEEK materials are very stable and can be used for a lifetime.