Cranial repair is a relatively old procedure that has been developed for thousands of years in human history. After a long period of development, cranial repair is now a very mature and routine procedure in neurosurgery. Of course, with the continuous development and improvement of technology, cranial repair materials are also evolving and changing towards more advanced and better adapted to the human cranial environment. The early cranial repair materials used by our medical practitioners include calcium phosphate bone cement, plexiglass, silicone, hydroxyapatite, etc., but the results of these materials were not satisfactory and they were no longer used due to various problems. Currently, titanium is the most widely used material for skull repair in clinical practice. Will titanium alloy fall off for skull repair? When titanium alloy is used for skull repair, the titanium alloy mesh is covered on the bone window and fixed with titanium nails, so it is generally unlikely to fall off. However, although titanium alloy has advanced performance compared to the traditional materials, it also has many defects and shortcomings. For example, the hardness of titanium alloy material is not enough, so it may be easily deformed by external force after surgery; titanium alloy is a metal material with poor heat insulation, so the patient will be very sensitive to the external hot and cold environment after surgery, resulting in a lot of discomfort; the edge of the titanium alloy covered repair may produce wear and tear on the scalp; after surgery, rejection of infection may occur, and even cause the scalp to break and material exposed, etc. Therefore, the use of titanium alloy for cranial repair is currently not recommended. At present, the more advanced cranial repair material is polyetheretherketone peek material. Mr. Li from Shandong Province had a defect in the parieto-occipital area due to a fall from height, and he often had dizziness and headache, and was also under great psychological pressure, so he needed skull repair surgery in time. Mr. Li was repaired with our advanced polyetheretherketone peek material, and the result was very good. Our team performed peek skull repair surgery for him, restoring his skull to a complete and beautiful shape, and also removing a piece of his heart disease, achieving a good result of anatomical integrity, functional perfection and beautiful appearance.