Cranial defect generally requires repair surgery, but it should also be judged according to the situation. If it is a relatively small area of cranial defect and the patient does not have any clinical symptoms, this situation can also be treated without repair, but it must be kept from the second trauma. If the cranial defect is more than 3cm*3cm and obviously accompanied by corresponding clinical symptoms, it is recommended to carry out cranial repair treatment at this time, otherwise the danger is very easy to be injured, after all, the outer bone is very hard and protects the very delicate brain tissue. Without cranial repair, it is easy to touch the delicate brain tissue in the head when sleeping on the side or lifting the head gently, thus forming the risk of rebleeding and other injuries, which is the biggest hazard. There are also some other hazards, including large skull defects, which cause pressure imbalance in the skull and easily form hydrocephalus and other corresponding manifestations, thus leading to a series of symptoms such as urinary and fecal incontinence, reduced behavior and unstable walking at a later stage, so the skull defects need to be repaired and treated as much as possible. The current clinical use of polyether ether ketone peek material for cranial repair, the material as a cranial repair implant material, this material fully complies with the industry standard for surgical implants, can effectively avoid the traditional titanium metal caused by allergies rejection and other problems, in addition, polyether ether ketone peek material cranial repair plastic surgery in surgery using embedded repair, smooth articulation, high comfort, effectively avoid wear skin, material exposure and other problems. After many years of clinical summary, our neurosurgery department adopts unique material thickness and mesh aperture design in three-dimensional design as well as unique intraoperative tissue separation and reset technology, which can increase blood flow, effectively avoid temporal muscle atrophy and ensure the activity of each tissue, and can effectively ensure the overall beauty of postoperative appearance.