Ischemic foci in the white matter of the brain cannot be eliminated by treatment, but treatment can reduce the recurrence of ischemic foci. Ischemic foci are formed when small arteries in the white matter of the brain are occluded due to sclerosis, resulting in ischemic necrosis of the local brain tissue. Generally, the diameter is not more than 3 millimeters, and it will not form obvious symptoms and signs in the clinic. The treatment is mainly to prevent atherosclerosis and to treat the diseases that cause atherosclerosis, such as controlling the blood pressure, blood sugar, blood lipid, and hyperhomocysteinemia, and the patients should pay more attention to their diets, low-salt and low-fat diets, and eat more fruits that contain vitamin C. Also, the patients should Initiate secondary prevention of cerebrovascular disease, to take oral Bay Aspirin to prevent cerebral infarction and prevent the increase of ischemic foci.