The causes of cerebral infarction are various, the most important is the narrowing of blood vessels due to various lesions, such as atherosclerosis or arteritis, etc.; followed by the formation of blood clots due to various reasons, such as rupture of plaques formed by atherosclerosis, and dislodgement of cardiac embolism formed by atrial fibrillation; there are also causes due to the insufficient cerebral perfusion and hypercoagulable state of the blood, and so on. Atherosclerosis is the most important cause of cerebral infarction. The plaque formed by atherosclerosis is the main factor causing the narrowing of blood vessels, huge plaque can directly cause serious narrowing of arteries and then lead to occlusion, the narrowing of blood vessels will lead to a decline in blood flow, resulting in a decline in the perfusion of the distal arteries and slowing down of blood flow, and further thrombus will be formed and cerebral infarction occurs; there is also a part of unstable plaques, which will lead to the destruction of the endothelium, and then the formation of platelet aggregation locally. The formation of thrombus, or cause the rupture of the lipid core within the plaque, these thrombi and dislodged plaques are carried away by the blood flow, blocked in the distal blood vessels, the formation of embolism. The emboli formed by atrial fibrillation are also an important factor. Atrial fibrillation is an irregular beating of the atria, in which case blood cannot flow completely from the atria into the ventricles, and the blood stagnates, leading to the formation of blood clots, which can be dislodged to form emboli that travel forward with the blood flow and block small blood vessels, and if they are blocked in the cerebral arteries a cerebral infarction forms, and this type of cerebral infarction is known as cardiogenic embolism. The blood itself, due to a variety of factors such as autoimmunity, can also lead to the formation of blood clots and the formation of cerebral infarction. In addition, there are some unexplained cerebral infarction. To summarize, the causes of cerebral infarction are complex, among which the most common and important cause is atherosclerosis. In the process of cerebral infarction treatment, the first thing to do is to distinguish the cause of the disease in order to carry out targeted treatment.