Cranial defects are a common disorder in neurosurgery, and the dangers of cranial defects are still very great. One is the lack of protection, which may cause secondary damage and even directly threaten the safety of brain tissue, resulting in serious consequences; another is that cranial defect may cause some dysfunction of the intracranial nervous system, resulting in some uncomfortable symptoms, which is usually called cranial defect syndrome; another important hazard is that it may cause great damage to the patient’s psychology and spirit, and the patient may have The patient may have a great sense of low self-esteem. Therefore, cranial defects should be repaired in a timely manner. Some patients ask about the symptoms of heat expansion and cold contraction after skull repair. This is related to the material used for cranial repair. At present, the widely used material for skull repair in most hospitals is titanium alloy titanium mesh material, which has a certain coefficient of thermal expansion and contraction and may cause thermal expansion and contraction due to the change of external temperature, thus producing a lot of discomfort; at the same time, the metal material of titanium mesh is not well insulated, and the external hot and cold environment may directly affect the temperature of this material, which in turn affects the intracranial At the same time, the titanium mesh material also has other problems, such as postoperative infection and rejection, deformation, wear and tear of the scalp, resulting in material exposure, affecting the CT magnetic examination and so on. Therefore, it is not recommended to use titanium mesh material for skull repair at present. At present, we adopt the new polyether ether ketone peek material and carry out peek cranioplasty with great success in clinical practice. Ms. Wang from Shanxi, who had a serious cranial injury caused by a car accident, was left with a cranial defect in the left temporal parieto-occipital area after a craniotomy in a local hospital, and after a detailed understanding, he and his family rushed to Beijing from a long distance to have peek cranioplasty performed by our team. Ms. Wang’s skull was restored to its full beauty and some of her preoperative neurological symptoms were improved with good results. Our team adopts the very advanced polyetherether peek material, and constantly carries out technical improvement and upgrade, material optimization design, and introduces the concept of aesthetic plastic surgery. Thus, the peek cranioplasty can not only complete good cranial repair, but also do a good job in ensuring tissue activity, neurological function integrity and skull shape proportional aesthetics, achieving anatomical integrity, functional perfection and aesthetic overall unity, receiving good comments and recognition from the majority of patients and their families.