Cranial repair is significant in that the repair not only results in faster venous return, but also in a one-fold increase in the rate of cerebrospinal fluid circulation. Postoperatively, it can loosen the adhesion of dura mater to the edge of the skin flap and bone window, and release its pulling, twisting and compression of blood vessels on the surface of brain tissue. This improves the hemodynamics of local brain tissue and promotes the recovery of neurological function. In addition, the direct compression of the cranial cavity by the scar between the dura mater and the skin flap and cerebral cortex is relieved. The longer the decompression time of the debridement flap, the larger the bone window, the more obvious the above compression symptoms before repair. The time of cranial repair surgery usually takes 1-2 hours, do postoperative temporal muscle atrophy is subsidence patients during the period of the material is also important to choose the choice of surgical materials. If the cranial bone repair after surgery or will be sunken what will be the reason? The main reasons for temporal depression after cranial defect repair surgery are as follows: 1, temporal muscle atrophy after surgery. 2.Decompression under the temporal muscle during surgery, which is not taken into account during the secondary surgical repair. 3.Localized direct external blows. 4.Sleeping on the affected side for too long, resulting in long-term deformation of the repair material by force. 5.Long-term pulling of temporalis muscle leads to local deformation. 6.Factors of the repair material. In the case of cranial bone repair surgery to choose the right hospital, followed by the selection of appropriate materials, professional doctors will give their own surgery zero error, good materials will make their lifelong worry-free, generally recommended to go to a larger hospital for surgery. The current clinical application of a new type of PEEK material for repair of the skull, the material has a three-dimensional molding, similar to the autologous skull repair material.