There are various causes of cerebral infarction, the most important being the narrowing of blood vessels due to various lesions, such as atherosclerosis or arteritis, etc.; followed by the formation of blood clots from various causes, such as the rupture of plaques formed by atherosclerosis, the shedding of cardiac emboli formed by atrial fibrillation; and some other causes are due to insufficient cerebral blood perfusion, hypercoagulable state of blood, etc. Atherosclerosis is the most important cause of cerebral infarction. The plaque formed by atherosclerosis is the main factor causing the narrowing of blood vessels, and the huge plaque can directly cause the serious narrowing of arteries and then lead to occlusion. These thrombi and dislodged plaques are carried away by blood flow and blocked in the distal vessels, forming embolism. The emboli formed by atrial fibrillation are also an important factor. Atrial fibrillation is the irregular beating of the atria, in this case, the blood cannot completely flow from the atria to the ventricles, and the blood is stagnant, leading to the formation of thrombus, which can be dislodged to form emboli with the blood flow forward and blocked in the cerebral arteries to form a cerebral infarction, and this type of cerebral infarction is called 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 all other rare factors that can unexplainedly lead to cerebral infarction. In summary, the causes of the formation of cerebral infarction are complex, of which the most common and important cause is atherosclerosis. In the treatment process of cerebral infarction, it is necessary to first distinguish the cause in order to carry out targeted treatment.