Carotid artery strong echogenic plaque is determined by the thickness of the carotid intima, the thickness of the carotid intima exceeds 1.2mm, that is, carotid plaque formation. Carotid plaque formation mainly has the following aspects: first, carotid artery vascular sclerosis, normal blood vessels are more elastic and have a certain control effect on blood flow rate, while the elastic outer wall can relieve the pressure of the lumen, arterial vascular sclerosis becomes less elastic, vascular pressure becomes larger, the brittleness of blood vessels increases, and there is a risk of blood pressure increase vascular rupture and bleeding. Secondly, plaques have different effects, unstable plaques have the risk of shedding at any time, and plaque shedding will be blocked with blood flow to form thrombus emboli in the narrowed blood vessels, leading to ischemia and hypoxia, such as brain infarction. Thirdly, plaque adheres to the wall of blood vessel, resulting in narrowing of the lumen and symptoms of brain ischemia and hypoxia, such as dizziness, headache and other head discomfort, and the symptoms are gradually obvious as the percentage of blocked lumen increases.