In general, carotid plaques >1.5mm or more than 50% of the rim are atherosclerotic plaque formation and are more dangerous. Carotid ultrasonography measures the carotid artery intima-media thickness. Thickness <1.0mm, belongs to the normal intima-media thickness. 1.0~1.5mm, belongs to the carotid artery intima-media thickening or atherosclerosis. 1.5mm or more than 50% of the edge is atherosclerotic plaque formation, which is more dangerous. Judge the risk of atherosclerosis also need to look at the plaque texture, such as low density, mixed density or plaque surface fiber cap rupture, it is easy to fall off, the formation of embolus, blocking the distal vessels, resulting in acute cerebral infarction, the risk is greater. Therefore, when carotid plaque appears, no matter how big or small, you need to actively consult the doctor and follow the doctor’s instructions for reasonable treatment.