Cranial repair is a common neurosurgical procedure to repair the skull for cranial defects caused by traumatic brain injury. The longer the cranial defect, the higher the incidence of cranial defect syndrome and secondary brain damage. In order to restore the cranial cavity confinement, maintain the physiological intracranial pressure stability and reduce the cranial defect syndrome. Cranial repair should be performed for cranial defects of 3 cm or more in diameter, without muscle coverage and without contraindications. It is generally considered appropriate to repair after 6 months after craniotomy. What should I not do after cranial repair? PEEK can completely restore the anatomical structure of the skull, and it is a bionic bone that is highly compatible with the autologous skull. It can adapt to the growth and development of autologous cranial bone. Of course, there are some precautions that need to be paid attention to after the skull repair, 1 month after the removal of stitches, do not scratch the skin of the repaired part to prevent infection, avoid strenuous exercise, avoid external impact on the repaired skull part. In normal life, eat more protein food, quit smoking and drinking, eat a diet rich in high protein, vitamins and coarse fiber, avoid spicy and stimulating food, prohibit smoking, alcohol, coffee and strong tea, arrange work and rest time reasonably, and develop good living habits to promote the growth and healing of the incision.