Cranial defect is a relatively common craniofacial disorder, which often occurs due to traffic accidents and craniofacial surgeries. First of all, without the protection of the hard skull, the brain tissue inside the skull will be easily damaged by the outside world; and without the skull, the environment of the cranial cavity will change drastically, the intracranial pressure will be unstable, the blood circulation and cerebrospinal fluid circulation may be abnormal, resulting in a series of syndromes, which may even be life-threatening; in addition, the unattractive appearance of the skull will also cause great psychological and mental stress to the patient. The unattractive appearance of the skull can also cause great psychological and mental pressure to the patient. Therefore, skull repair surgery should be performed in a timely manner after the occurrence of cranial defects. In fact, the practice of cranial repair has been practiced by our ancestors thousands of years ago and has been developing for thousands of years. Currently, cranial repair is a very routine procedure in neurosurgery, and the technique is very mature and widely performed. For example, titanium mesh repair of cranial defects has been clinically associated with various problems, such as postoperative infection, rejection, non-healing of the scalp, and exposure of the material. In addition, as a metal material, titanium mesh is not well insulated, and the patient will be very sensitive to the external hot and cold environment after surgery, causing various discomforts, and the metal rays are impermeable, which will interfere with various post-operative medical examinations such as CT and MRI, resulting in artifacts. At present, the more ideal repair material to the latest type of polyetheretherketone material, also commonly known as PEEK material, the English full name polyetheretherketone, is a special polymer material, its performance is comparable to the autologous cranial bone, no infection, no rejection, no heat conduction, no conductivity, no artifacts in radiological examination, good shaping effect, high post-operative comfort, by patients. It is generally praised by patients.