Carotid artery is one of the main blood vessels in the human body, mainly responsible for the heart to brain blood transport work, if the carotid artery lesion, carotid artery wall plaque or wall thickening, carotid artery stenosis caused by insufficient blood supply to the brain, the phenomenon of cerebral ischemia, due to cerebral ischemia led to the emergence of a number of pathologies, bringing harm to the health of patients. Carotid artery stenosis is a vascular disease, with middle-aged and elderly people as the main incidence group, mostly seen in patients with hyperglycemia, hypertension, hyperlipidemia and other diseases. Its clinical manifestation is cerebral ischemia. After cerebral ischemia cannot be effectively treated, patients often experience dizziness, weakness of limbs, aphasia, memory loss and other symptoms, and serious cases may go into coma first or lose their lives as a result. Therefore, treatment measures should be taken as early as possible when carotid artery stenosis disease appears to avoid aggravation of the disease to bring more harm. Carotid artery stenosis treatment is divided into three treatment stages, the first stage for mild carotid artery stenosis, carotid artery stenosis (stenosis degree <50%) no symptoms, you can choose drug treatment. The second stage is for moderate to severe carotid stenosis (≥50% stenosis) with symptoms, such as dizziness and memory loss, which can be treated by carotid endarterectomy. The third treatment stage is for carotid artery occlusion treatment, where the carotid artery is completely occluded, cerebrovascular bypass surgery can be chosen. If the carotid stenosis reaches 99%, which method of treatment should be chosen? Patients with carotid stenosis up to 99% belong to severe stenosis, not complete occlusion, patients can choose "carotid endarterectomy" treatment, the treatment effect is the same as the treatment effect of patients with stenosis ≥ 50%, patients can achieve recovery.