CTA examination of blood vessel stenosis is relatively accurate and has high clinical reference value. It is recommended that patients suspected of having blood vessel stenosis should seek timely medical treatment, identify the cause and then treat it actively to avoid accidents. CTA examination requires intravenous injection of contrast agent and scanning examination using CT, which can find out whether there are malformations and abnormalities in blood vessels. Generally speaking, CTA examination is mainly applicable to the aorta, peripheral blood vessels, coronary arteries and other vascular diseases, is currently one of the more widely used clinical examination, for pregnancy and contrast agent allergy should not be carried out this examination. Although CTA has a high reference value, it still has some limitations in the judgment of stenosis, especially when there is vascular calcification, if necessary, follow the doctor’s advice to carry out angiography, which is the “gold standard” for the diagnosis of stenosis of blood vessels.