The patient fell from a height and caused a parieto-occipital cranial defect, often have dizziness and headache symptoms, but also bear great psychological pressure, need to carry out timely cranial bone repair surgery. So what material should be chosen to repair the skull defect? Cranial defect application mainstream cranial bone repair materials are mainly titanium alloy class, polymer polyether ether ether ketone two types of cranial bone repair materials. The difference between them is that polyether ether ketone has many advantages and is expensive; titanium alloy has many disadvantages and is cheap. With the continuous development and improvement of technology, cranial bone repair materials are also in constant iteration of evolution, towards a more advanced and perfect, more adapted to the direction of the development of the human skull environment. Plexiglass and bone cement have been eliminated in cranial bone repair surgery. Advantages of polyether ether ketone: elasticity, hardness, thermal conductivity similar to the skull; histocompatibility is currently the best; on the X-ray, nuclear magnetic has no micro-imaging, does not affect to do nuclear magnetic, CT. its disadvantage is that the price is relatively expensive. The advantage of titanium alloy is relatively cheap, but the disadvantage is that titanium alloy material hardness is not enough, there may be deformation by external forces; titanium alloy metal material insulation is not good, after the operation, the patient will be very sensitive to the external hot and cold environments, resulting in a lot of discomfort; titanium alloy covered repair of the edge of the scalp may be abrasive, and after the operation, may also occur in the rejection of infections, and even lead to scalp breakage, the material is exposed and so on. The situation. Therefore, the use of titanium alloy for skull repair is not recommended at present.