Most cranial defects are caused by open craniosynostosis or firearm penetrating injuries, and some patients have residual bone defects due to surgical decompression or diseased craniotomy. In recent years, due to the high brain pressure of heavy craniocerebral injury, the method of decompression of bone flap is prevalent, so there are many artificial huge cranial defects, in fact, a considerable number of patients do not need to perform large bone flap decompression, most of them are made in the decision of surgery, not without impropriety. Most cranial defects are caused by open craniosynostosis or firearm penetrating injuries, and some patients have residual bone defects due to surgical decompression or craniectomy. Defects with a diameter of more than 3 cm, especially those located in the frontal area, are often associated with one or another symptoms, such as dizziness, headache, local tenderness, irritability, restlessness, etc.; or patients are afraid of the pulsation, expansion, collapse of the defect area, fear of the sun, fear of vibration and even fear of loud noises, often with poor self-control, concentration and memory loss. Due to the high brain pressure of heavy craniocerebral injury, the method of decompression of the bone flap is prevalent, so there are many artificially large cranial defects, in fact, a considerable number of patients do not need to perform large bone flap decompression, most of them are made in the decision of the operation in the creation of the urgency, not without defects.