An important auxiliary examination for cranial defects is CT, which can be used for two purposes: Firstly, it can get the three-dimensional data of the entire skull, so that a digital simulation design can be done to design a prosthesis that matches the cranial defect perfectly for cranial defect repair. Secondly, after the CT scan, you can see the recovery of the original injured brain tissue in the deep part of the brain, and if the injured brain tissue recovers well, then the skull defect can be repaired at this time. This means that a CT scan will basically determine the size of the skull defect to be repaired and whether or not surgery should be performed immediately. The main purpose of this is to look at the inside of the head to see if there is any hemorrhagic infarction and other related lesions, as well as to rule out hydrocephalus and other corresponding conditions. Then there is the head ct plus cranial triangulation reconstruction examination, this can be reconstructed on the computer the specific shape of the cranial defect, can be based on the actual imaging data, the production of suitable for the individual cranial titanium mesh, so as to lay a good foundation for the subsequent repair work. These are some of the basic examinations, if some other related lesions are found during the examination, it is also necessary to further improve other related examinations, including such as head nuclear magnetic and enhancement ct, etc., which should be judged according to the actual situation. Cranial defects are common sequelae after craniocerebral injury, cranial osteoma and other craniotomies. When the diameter of the defect exceeds 3 centimeters, it not only seriously affects the aesthetics of the patient, but also may cause various clinical manifestations such as headache, dizziness, mood changes, fluttering of the defect area, etc., and may even induce epilepsy and other serious diseases, which seriously affects the normal work and life of the patient. Cranial bone repair is mostly used to treat cranial defects in clinical practice. Cranioplasty is a common brain surgery for repairing cranial defects caused by traumatic brain injury and craniotomy. Due to craniocerebral trauma and brain surgery to remove the bone flap, benign tumors or tumor-like resection of the skull, chronic osteomyelitis of the skull, etc., resulting in a change in the shape of the defective area of the skull, the scalp is affected by the atmospheric pressure, so that it is inwardly compressed by the brain tissues, and cranial bone repair, which can solve the defective area of the blood supply obstacles, cerebrospinal fluid circulation abnormalities and other problems, and also solve the appearance of the restoration of the plastic surgery problem.