After traumatic brain injury can cause cerebral infarction for the following reasons: 1. After traumatic brain injury, there is a process of elevated intracranial pressure, which may last for 2-3 weeks. Because of the increased intracranial pressure, the blood vessels on the surface of the brain are compressed, resulting in vascular occlusion and cerebral infarction; 2. In times of poor peripheral blood perfusion, i.e., shock, such as insufficient blood perfusion to the heart, the head and other vital organs, intracranial blood vessels also become occluded, which is also an important cause of cerebral infarction; 3. Blood flowing in the blood vessels is too sticky or there is an embolus in the blood vessels, e.g., in elderly people, who themselves have an intracarotid arteries in the basilar artery system have plaque attached to the wall, plaque in severe craniocerebral injury, there is a possibility of dislodgement, causing distal that is, cerebral intracranial corresponding blood vessel occlusion.