Cranial repair is usually caused by traumatic brain injury resulting in injury. Cranial repair is a common procedure in brain surgery to repair cranial defects caused by traumatic brain injury and craniotomy, etc. Cranial trauma and brain surgery to remove bone flaps, removal of benign tumors or tumor-like tumors of the skull, chronic osteomyelitis of the skull, etc. Cranial defect is something difficult for every patient to face. Brain tissue loses both strong protection and affects the aesthetics of the skull. Many patients who damage their skull by accident hope to regain their health through surgery. Modern medical technology is advanced and skull repair surgery is gradually becoming a routine neurosurgical procedure. Many patients are also willing to actively undergo surgical treatment after understanding and comparing. The preoperative anesthesia and sterilization are no different from the regular surgery. During the surgery, the surgeon will cut the scalp at a suitable location and bluntly separate the periosteum according to the damaged part, shape and size of the skull. The exposed bone window is clearly visible after hemostasis of the surgical field. The surgeon takes the preoperative three-dimensional plasticized bone plate repair piece, adjusts the shape according to the physiological structure of the damaged area, fixes and resets it, and then sutures the scalp layer by layer. A successful skull repair is completed. Of course, cranial bone repair needs to be done by a professional physician with experienced skills and the choice of repair materials. The material we currently use for cranial bone repair is PEEK, which provides the expected results for patients. This material has the advantages of three-dimensional reconstruction, similar to the autologous skull, high temperature resistance, and does not interfere with post-operative CT examinations, etc. It is currently the better material for skull repair.