Carotid artery stenosis refers to the blockage of large blood vessels supplying the cranium and brain, the cause of which is mainly plaque, of course, there are other reasons such as inflammation. After blocking the blood vessel, it will cause a lack of circulation, resulting in ischemia of the cranial blood vessels, which may be manifested as hemiparesis, aphasia, or even epilepsy, etc. Carotid artery stenosis is a condition called carotid artery stenosis. The incidence of carotid artery stenosis is about 5% to 7% globally. In China, the incidence rate is much higher than this value, because the national diet, due to high salt, high fat and other unhealthy diet, so the incidence of hypertension, diabetes mellitus, hyperlipidemia is relatively high. Therefore the incidence rate is also much higher than 5-7%. Ischemic stroke accounts for more than 4/5 of all cerebrovascular diseases, and carotid artery stenosis accounts for almost half of the incidence rate of ischemic stroke, so carotid artery stenosis is a key point in cranio-cerebral vascular treatment. Since it is the most important blood vessel supplying blood to the craniocerebral vessels, problems such as blockage or stenosis cause the most serious harm.