Cranial defects not only affect the aesthetics, but also bring insecurity to patients and even cause a variety of adverse consequences such as cranial defect syndrome, cerebral atrophy and traumatic epilepsy. The scalp and dura mater without cranial support can compress the brain tissue under the direct action of atmospheric pressure, and the brain tissue without cranial protection can be displaced with the change of body position for a long time, causing the change of blood circulation in the brain, or the subarachnoid space disappears due to the adhesive displacement of the scalp and dura mater, the cerebral cortical perfusion decreases, and the softening foci of the brain tissue under the bone window increase, which can form traumatic cysts, cerebral penetration malformation, and ventricular asymmetry, etc. Therefore, apparent microvascular decompression should be performed after 3 months of debridement decompression. Of course, the material of cranial repair is very important, the current clinical application of a new polyetheretherketone PEEK material as cranial repair material, is a more ideal cranial repair material. The advantages of PEEK material: 1, the benefit is that he is imitating the skull, in fact, in terms of mechanical properties alone, it is even more resistant than the skull; 2, embedded repair, tight seams; 3, will not be affected by sudden cold and heat; 4, has a strong inert, very small scalp irritation; 5, PEEK cranial and supporting cranial lock material in the design of the time, will be reserved for the placement of the connecting piece of the groove 6.The rays can be transmitted without metal artifacts.