If the area of old cerebral infarction is relatively small or not in a critical area, most patients do not have any symptoms and signs, and usually infarct foci are found in the brain during CT examination. If there are necrotic lesions in the functional areas such as the internal capsule and thalamus after previous cerebral infarction, the patient may have sequelae such as hemiplegia or numbness of the limbs or clumsy speech. Patients with old cerebral infarction should prevent the recurrence of cerebral infarction, take long-term secondary prevention of cerebrovascular disease, take oral aspirin or anticoagulants and atorvastatin calcium lipid lowering and stabilizing drugs according to the cause, and actively control the risk factors of cerebral infarction, including hypertension, diabetes, hyperlipidemia, and avoid smoking and drinking alcohol.