The brain is the commander of the human body and governs the life activities of the whole person. The brain is soft tissue, which is very vulnerable to damage. And the Creator is very far-sighted, he magically designed a layer of hard cranial bone in the outer layer of the brain as a protective barrier. With this barrier, there is also a stable and safe intracranial environment. However, there are still many irresistible factors in life that can cause cranial defects. Cranial defects are very dangerous and require prompt skull repair surgery. When it comes to surgery, many patients may often worry about the after-effects of skull repair surgery. If titanium is used as the skull repair material, then there are some possible sequelae. For example, titanium alloy is not insulated, which may cause patients to be sensitive to hot and cold reactions after surgery; some patients may have rejection reactions, which may cause the titanium plate to be exposed; titanium mesh is usually a covering repair, which may produce chronic cutting ulcers and stress perforation leading to cranial repair failure; and this metal material may affect post-operative medical examinations such as CT MRI, and so on. At present, polyether ether ketone, or PEEK, is an advanced cranial repair material that can completely overcome the above defects and achieve very satisfactory repair results, basically without postoperative sequelae.