Cranial defects are dangerous and should not be taken care of. The appearance is unattractive, some will be collapsed, some will be bulging, either will make the patient become less confident and have a deep sense of inferiority; in addition, the loss of skull protection, brain tissue is easily damaged, easy to cause abnormal cerebrospinal fluid circulation, blood supply disorders and other problems. Most clinical patients with skull defect will follow the doctor’s suggestion to repair in time and return to normal life, however, there are still a small number of people who start not to care about the aesthetic problem of appearance, plus they feel no other discomfort, so they do not take remedial measures. With the passage of time, seven or eight years later, they suddenly want to repair again. Is it still necessary to repair the skull after seven or eight years? The current medical recommendation for skull repair is 3 months after debridement and decompression, when the skull can be repaired to achieve an ideal repair and avoid further problems. Strictly speaking, the time span of seven or eight years of skull defect is indeed a bit long, but it is not irreparable, and it is recommended to go to regular hospitals to choose suitable materials for skull repair surgery in time, which can also restore the integrity. Currently, a new type of polymer material is introduced clinically, namely Peek material as the implant material for cranial bone repair, PEEK (polyether ether ketone) has many advantages such as high temperature resistance, high hardness, strong protective performance, and does not affect post-operative review. In addition, peek material can improve the overall aesthetic appearance after 3D reconstruction, 3D printing, and combined with the concept of aesthetic plastic surgery.