Cerebral infarction is characterized by high morbidity, high mortality, high disability and high recurrence rate, and most of the survivors have different degrees of hemiparesis, aphasia and dementia. It brings heavy economic and social burdens to families and society. Conventional treatment is often ineffective. Carotid artery stenosis is one of the main causes of cerebral infarction, accounting for about 30%~50%. People with carotid artery stenosis high-risk factors: age 50 or older, patients with hypertension, diabetes mellitus, hyperlipidemia, atherosclerosis. Especially patients who have had a small, mild cerebral infarction in the past or present. All of them should have regular carotid ultrasound and other examinations. At present, in addition to drug therapy, clinical surgery and interventional therapy: 1, carotid stenting. The stent is placed in the narrowed lumen of the blood vessel in a minimally invasive way. Carotid endarterectomy. Surgical removal of fatty plaques in the narrowed blood vessels. Through the above methods, the narrowed blood vessels can be opened up and the blood flow to the brain can be restored, so that some hemiplegic patients can stand up again, aphasic patients can speak fluently again, and those who are unable to see clearly can have light restored in front of their eyes.