With old brainstem infarction, the patient is considered to be past the acute phase of brainstem infarction. However, the patient is found to have an old brainstem infarction, suggesting that the patient should initiate secondary prevention of cerebrovascular disease and actively look for risk factors for cerebral atherosclerosis. Cerebrovascular related investigations can be performed if necessary. For patients with cerebral infarction caused by general atherosclerosis can be accompanied by hypertension, hyperglycemia, and hyperlipidemia, as well as poor lifestyle habits, such as smoking and alcohol abuse. These patients need to actively control hypertension, diabetes, hyperlipidemia, obesity, smoking and drinking, change their lifestyles, regularly review all indicators and actively implement secondary prevention of stroke in order to effectively reduce the risk of recurrence. Usually, the second occurrence of cerebral infarction is usually more serious than the first. Therefore, old cerebral infarction is equally dangerous.