The skull is a very, very important part of the human skeleton, playing an important role in protecting brain tissue, maintaining intracranial pressure and a stable intracranial environment. Cranial defects require prompt cranial repair. Cranial bone repair surgery is now a routine and commonly used surgery in neurosurgery, because many craniocerebral surgeries require the removal of bone flaps, and many traffic accidents, accidental injuries, etc. may also cause damage to the skull, so there are now more and more patients with cranial bone defects, so the cranial bone repair surgery needs to be carried out more often. Cranial bone repair surgery technology has been more mature, and the choice of what kind of repair material is very important. At present, the clinical application of the more advanced and ideal material is polyether ether ketone PEEK material, which has great advantages. Advantages of PEEK material: 1, good biocompatibility, will not produce foreign body reaction. 2.Three-dimensional reconstruction, 3D printing, perfect shaping. 3.Radiation can be transmitted, will not affect the postoperative CT MRI and other imaging examinations. 4, Embedded repair, completely fit in the bone window, smooth articulation, will not produce cutting irritation injury. 5. Good heat insulation, not too sensitive to external hot and cold environments. 6, high hardness, can play a good protective role.