The cause of most patients with ischemic cerebrovascular disease is atherosclerosis and the presence of severe intracranial or extracranial vascular stenosis. To prevent the occurrence and recurrence of atherosclerotic ischemic cerebrovascular disease the key measure is the treatment of atherosclerosis, the means of which are comprehensive, including: changing poor lifestyle, controlling various risk factors that lead to atherosclerosis, long-term use of statins, endovascular stenting, carotid endarterectomy, etc. The Chinese Guidelines for Secondary Prevention of Ischemic Stroke and Transient Ischemic Attack 2010 recommends that carotid artery stenting (CAS) be considered for patients with symptomatic carotid artery stenosis (>70%) who are not eligible for carotid endarterectomy (CEA). (CAS). Therefore, it can be said that endovascular stenting is aimed at certain appropriate vessels in the first place, rather than solving the entire problem. The factors that cause stenosis are comprehensive, including age, gender, race, various chronic metabolic diseases, hypertension, smoking, alcohol consumption, etc. These factors cannot be solved by endovascular stenting, but require long-term medication to control hypertension, hyperlipidemia, hyperglycemia, etc., together with changes in poor lifestyles, etc. to be effective. In addition, antiplatelet drugs are required after endovascular stenting. The 2011 edition of the Endovascular Interventional Treatment Guidelines for Ischemic Cerebrovascular Diseases and the 2010 edition of the Chinese Guidelines for Secondary Prevention of Ischemic Stroke and Transient Ischemic Attack 2010 both clearly state that antiplatelet aggregation drugs are required before and after stenting for cerebrovascular disease. If tolerated, postoperative aspirin should be taken for life and clopidogrel for at least 1 month.