This is a 12-year-old girl from Heilongjiang. She should have enjoyed a happy childhood, but instead she had to lie in a hospital bed. About a year ago, she was involved in a car accident and suffered severe traumatic brain injury, and underwent subdural hematoma removal + decompression of the bone flap at a local hospital. Due to the severity of her injuries, the doctor even said that she might become a vegetable. Fortunately, he recovered quite well after surgery, but was left with a large cranial defect on the frontotemporal surface. Recently, she underwent PEEK cranioplasty, and her skull was restored to its original shape, and the original collapsed half of her head was re-expanded. Here is a reminder that cranial defects are a relatively common disorder, and larger cranial defects may cause serious consequences, threatening the cranial safety of patients, affecting the aesthetic appearance of the head, bringing a series of cranial defect syndrome, and also causing a great psychological shadow to patients, so timely repair is needed. A large area of cranial defect can be very harmful to the body, causing a series of cranial defect syndrome, including dizziness and headache, weakness of limbs, vision loss, loss of smell, mood swings, irritability, unexplained discomfort and various mental disorders, etc.; lack of hard cranial protection, the brain will always be in danger, and it is easy to directly injure the brain tissue if it is hit and touched by external force or sharp objects. In addition, the deformity of the skull is very unattractive and can make patients feel inferior. In addition, the deformity of the skull is very unattractive and can make the patient feel inferior. For the aforementioned small patient with a defect of about 10 cm, the skull should be repaired in time, both from the cosmetic and safety points of view. At present, our team widely uses advanced polyetheretherketone PEEK as the skull repair material, and constantly carries out technical improvement and upgrade and material optimization design, and also innovatively introduces the concept of aesthetic plastic surgery, thus carrying out PEEK skull repair plastic surgery, which can achieve the overall unity of structural restoration, functional perfection, and aesthetic appearance, which will be of great benefit to the patient’s future growth, study, life, and work in all aspects. The benefits of PEEK are