Cranial defects are a very common affliction today. The current social environment is complex and there are always various dangers. Traffic accidents, production safety accidents, falling objects, fights and various cranio-cerebral surgery, etc., all of which may eventually cause skull defects. Cranial defects can be very harmful to the human body and should be repaired in a timely manner. Cranial repair is a routine surgery in neurosurgery, which is a kind of surgical operation to repair cranial defects caused by various reasons, aiming to rebuild a complete and closed cranial cavity, remodel a stable intracranial environment, and guarantee the normal performance and operation of intracranial cerebrospinal fluid circulation, blood circulation, and the function of nerves, which is of great significance to the health of the organism and the whole operation of life. Therefore, if a cranial defect occurs, you should go to the neurosurgery department for cranial bone repair surgery in time. At present, there is a more advanced material, i.e. polyetheretherketone peek material, which is a new type of special polymer material, and its various properties are very close to the human autologous skull, so as to achieve a good repair effect. Our team widely uses this new polyether ether ketone peek material for cranial bone repair, and the team constantly carries out technical innovation and upgrading and material optimization design, and introduces the concept of cosmetic plastic surgery, so as to comprehensively carry out the peek cranial bone repair surgery, and achieve good results in the clinic.