Cranial repair is a very important thing, according to a variety of reasons caused by cranial defects and repair an important measure, in ordinary times people are not easy to find, but it will become more and more serious, so a year later to do cranial repair surgery late? Cranial defect is a relatively common craniocerebral disorder, every year in our country there are a large number of people because of such and such reasons (car accidents, falling from height, cranial surgery, etc.) and lead to cranial defects. Cranial defects will bring serious harm, the lack of a hard shell protection, intracranial tissues will be susceptible to external direct injury; in addition, the lack of a part of the skull, destroying the closed cranial cavity environment, intracranial pressure is not stable, intracranial blood circulation, cerebrospinal fluid circulation, etc. are affected, which can lead to a series of neurological deficits; incomplete cranial appearance, but also on the patient’s psychological trauma, self-absorption, Low self-esteem, and even some patients have a tendency to depression, or worse, anorexia. Therefore, once cranial defect occurs, cranial bone repair should be carried out in time to solve the problems of lack of effective protection of brain tissue, blood supply obstacle, cerebrospinal fluid circulation abnormality in the defective area, to repair the intact cranial shape, and to restore the patient’s self-confidence. The timing of surgery for cranial repair is very important, and some patients ask if they can still have cranial repair after more than a year. Yes, it is possible. Generally speaking, the skull should be repaired within 3 months after the defect, if it has been more than a year, then it is more important to do the cranial bone repair surgery as soon as possible, so as not to produce more adverse symptoms. In addition, the choice of material for cranial bone repair is also very important. At present, there is a very advanced material called polyether ether ketone, which is also commonly known as PEEK material. This is a special polymer material, its properties are very close to the autologous skull, good biocompatibility, can be complex shaping, excellent mechanical properties, good protective properties, gradually become the trend of cranial bone repair materials.