The current clinical use of new polyether ether ketone PEEK material as a cranial bone repair material. The PEEK material as an ideal material for cranial bone repair is because, PEEK material has very good tissue compatibility, basically will not produce rejection reaction, PEEK material ray transmissibility is good, does not affect a variety of postoperative medical examination. In addition, PEEK material in terms of elasticity, strength, thermal insulation, stability and other aspects of performance are comparable to the human skull, is a very ideal cranial bone repair material. However, patients with cranial defects should go to the regular hospital for cranial bone repair as early as possible, what are the benefits of repairing the cranium? Early repair of cranial bone defects, repair of cranial bone defects also has the following roles. ① Brain protection effect. Generally speaking, cranial defects with a diameter of more than 3cm, as long as they are not located under the temporal muscle or occipital muscle, they will be repaired. Cranial defects in the fronto-orbital region should be repaired for cosmetic reasons even if they are small and asymptomatic. (iii) Prevention and treatment of epilepsy: whether cranial repair can improve existing epilepsy, and (iv) possible prevention of brain atrophy. The best time to repair the skull is 3-6 months after decompression surgery, which is beneficial to repair the skull: 1, restore the original shape of the cranial cavity as soon as possible, which is conducive to the recovery of normal intracranial pressure and cerebral physiology. 2, prevent the displacement of brain tissue to the brain, which is beneficial to the brain. 3, prevent the displacement of brain tissue to the brain. 4, prevent brain atrophy. 2.Preventing the cerebral tissue displacement on the cerebral blood vessels of pulling, twisting, causing cerebral tissue ischemia, necrosis, so as to reduce the cerebral blood vessels supply area of cerebral nerve dysfunction further aggravation. 3.Prevent the cerebrospinal fluid circulation obstacle caused by the displacement of brain tissue, which may induce the subdural effusion on the opposite side of the defect or longitudinal fissure. 4.Early restoration of skull shape can relieve or eliminate headache, dizziness, memory loss and other complications caused by cranial defects, and also relieve patients’ anxiety or fear in time. 5, for the skull repair and ventriculo-abdominal shunt at the same time, can reduce the risk of surgery and anesthesia brought about by the increase in the number of surgical injuries, complications and sequelae of the incidence of patients and their families to reduce the mental and economic burden. 6, the earlier the operation time, the smaller the scar formation at the incision, the lighter the adhesion, the easier the separation during the operation, so as to achieve the purpose of less bleeding during the operation, short operation time and low cost. 7.Early cranial defect repair is conducive to the one-time treatment of traffic accidents. Traffic accidents not only bring physical and mental injuries to the patient, but also bring a lot of trouble to both families, generally due to the treatment costs are difficult to reach a consensus agreement and involve greater energy. If the patient is hospitalized for two surgeries at one time, it will have positive significance for both parties of the accident.