Cranial defects are mostly due to open cranial injury or firearm penetrating injury, and some patients are residual bone defects due to surgical decompression or diseased craniectomy. In recent years, due to the high brain pressure of heavy craniocerebral injury cases. The method of decompression of the bone flap is prevalent. As a result, there are many artificially large cranial defects. In fact, a significant number of these patients do not need to perform large bone flap decompression. Most of the decisions are made in the midst of the surgery. This is not without its shortcomings. The main thing is to avoid collision with the defect, strengthen nutrition and avoid strenuous activities! Winter snow, icy roads, it is easy to cause fall accidents. Especially cranial injuries, the lighter scalp contusion bleeding, concussion, skull fracture, the heavier brain contusion, intracranial hematoma, and even life-threatening. Today to teach you a few preventive measures: 1, the snowy road is slippery, if not mandatory, it is recommended to travel less, especially the elderly and frail. 2, wear non-slip shoes when going out. 3, small steps slowly, the center of gravity low forward (slightly bent hips bent knees, upper body forward). 4.We recommend wearing a warm hat to keep warm and shockproof. 5, walking in spacious, pedestrian, less icy road. 6, once the head injury, especially after the injury there is loss of consciousness, headache, vomiting, vomiting, numbness and weakness of the limbs, as soon as possible hospital examination and treatment.