Lower limb arterial occlusive disease should be detected early and treated promptly. First of all, people can make preliminary self-diagnosis against the early symptoms of the disease: if there is often pain in the calf stomach after walking a few hundred meters, or cold feet, then you should look at the color of the skin of your feet when you wake up early and sleep late, the color of the skin of the feet is often whitish or purplish when the lower limbs are ischemic, you can also feel the temperature of the feet, if there is a disease, the feet will be colder. You can feel the dorsalis pedis artery to see if there is pulsation, if the artery pulsation is normal, you can rule out, if the dorsalis pedis artery pulsation is very weak or disappeared, the possibility of suffering from this disease is very high, then you should go to the hospital for a systematic and comprehensive vascular specialist examination. The common methods of examination for arterial occlusive disease of the lower extremities are photoelectric flowmetry, segmental manometry of the lower extremities and imaging. Photoplethysmography provides information about the blood supply to the skin at the end of the affected limb and is useful for diagnosis. Segmental manometry of the lower extremities can be used to understand the location and degree of ischemia in the lower extremities through segmental manometry and ankle/brachial index measurement, which has become one of the routine tests for patients with lower extremity arterial occlusion. The main diagnostic imaging methods include lower extremity artery ultrasound, lower extremity artery CT angiography (CTA), lower extremity artery magnetic resonance angiography (MRA) and lower extremity artery digital subtraction angiography (DSA). Lower extremity artery ultrasound is the most important screening test for diagnosing lower extremity arterial occlusive disease, and has the advantages of being safe, non-invasive and inexpensive. It can reflect the location and degree of lower extremity arterial occlusion with high accuracy, but the ultrasound cannot visualize the whole picture of lower extremity atherosclerotic occlusive disease vessels. CT angiography (CTA) and magnetic resonance angiography (MRA) of the lower extremity arteries are non-invasive angiograms that can visualize the anatomical pattern of the peripheral arteries, but the small thickness of the CTA layer increases the amount of information and makes it difficult to read. The images of the main and iliac arteries and distal arterial branches are coarser and sometimes less clear and must be combined with ultrasound and ankle/brachial indices. DSA angiography is the “gold standard” for the diagnosis of lower extremity atherosclerotic occlusive disease. It can accurately show the location and degree of stenosis/occlusion, collateral circulation, and hemodynamic changes in lower extremity atherosclerotic occlusive disease. Another advantage of DSA angiography is that most patients can undergo interventional treatment such as balloon dilation and stent placement at the site of arterial stenosis or occlusion on the basis of diagnostic imaging, and the patient can be out of bed the next day. The patient can be out of bed the next day, thus saving the patient from the pain of surgery.