Global: 2.4% of the population suffers from peripheral artery disease, Western industrialized countries: 18% of the population suffers from peripheral artery disease incidence 4.5% It is expected that by 2030: 34% of Germans will suffer from peripheral artery disease, in China with the aging society into, lower limb atherosclerosis occlusive disease patients with 200,000 people per year, the number of diabetic foot patients is at a rate of 250,000 times per year The number of patients with diabetic foot is growing rapidly at 250,000 times per year. PAD (peripheral arterial disease) is a degenerative disease, which is a basic pathological process of large and medium arteries, mainly abnormal deposition of cells, fibrous matrix, lipids and tissue fragments, and complex pathological changes in the process of proliferation in the intima or middle layer of arteries. Etiology and pathogenesis According to the severity of the patient’s symptoms according to the Fontaine stage is divided into four stages The first stage, the mild complaint stage, feeling the affected limb skin temperature decreased, fear of cold, or mild numbness, easy fatigue after activity, extremity tinea pedis prone to infection and not easy to control; the second stage, the intermittent claudication stage, the patient walking calf muscle spasm, pain and fatigue weakness, stop walking after the symptoms improve, and then walking In the third stage, the resting pain stage, the lesion develops further, the lateral branch circulation is not sufficiently established, the ischemic symptoms of the lower limbs are aggravated, and pain, numbness and abnormal sensation are felt even at rest; in the fourth stage, the tissue necrosis stage, the lesion continues to develop to the occlusion stage, the lateral branch circulation is limited, nutritional disorders appear, and toe ulcers and gangrene appear. Diagnosis of arteriosclerosis-occlusive disease 1.Doppler ultrasound blood flow examination is simple, non-invasive and reproducible. -(3) 20% – 49% diameter reduction: triphasic or monophasic waveforms, reduced or absent reverse flow, broadened spectrum, disappearance of systolic window, and adjacent normal arteries. (4) 20% – 49% diameter reduction: reverse flow disappears, monophasic waveform, spectrum widens significantly, compared with the adjacent normal artery, peak systolic flow velocity increases by 30% – 100%; (5) 20% – 49% diameter reduction: reverse flow disappears, monophasic waveform, spectrum widens significantly, compared with the adjacent normal artery, peak systolic flow velocity (5) occlusion: no color flow signal. (5) Occlusion: no color flow signal. (3) X-ray color film examination of the limb X-ray plain film with arterial calcification shadow is of special diagnostic value. Arteriography is the “gold standard” for the diagnosis of atherosclerosis-occlusive disease, and it can clarify the part of surgery and select the surgical method. 5.X-ray computed tomography or imaging CTA, CT angiography (CTA) as a new non-invasive vascular imaging technology can accurately detect segmental stenosis and occlusion of lower extremity arteries.