Cranial defect precautions, a car accident, an accident, may cause defects in our cranium and put our lives at risk. The loss of the normal cranial barrier may lead to imbalance of intracranial pressure and displacement of brain tissue, which may cause localized brain tissue atrophy over time, aggravating the cerebral defect, thus causing a series of clinical symptoms. For example, dizziness, epilepsy, fear of the sun, fear of vibration and even fear of loud noises and psychological disorders, etc., which are the sequelae of cranial defects. Then, what are the precautions after cranial defect? First of all, we should pay attention to the psychological changes of the patients. Patients with skull defects often have strong fear of the beating, swelling and collapsing of the defective area in their hearts; they are afraid to look in the mirror and are unwilling to look at themselves in the mirror; and they are very prone to depression, fatigue, reticence and low self-esteem, so this requires that the family members of the patients, as well as doctors and nurses, should set up confidence for the patients and carry out psychological counseling and exchange of ideas. So this requires our patients’ families and their doctors and nurses to build up their confidence and provide psychological counseling and ideological communication. Secondly, after the cranial defect, we should choose the repair material carefully and go to the regular hospital in time to cooperate with the doctor’s treatment for the cranial repair. The material of cranial repair determines the patient’s recovery after surgery. Small side effects and strong applicability are the common concern of all patients’ families. At present, polyether ether ketone material, also known as PEEK material, is the most ideal repair material at present. Compared with the widely used titanium mesh, it has its own unique advantages, with excellent resistance to high temperature, chemical resistance and fatigue resistance, excellent strength, hardness and toughness, and no localized depression or deformation even when it is hit by external forces.