In peripheral arterial embolism, pain, pallor, loss of distal arterial pulsation, coldness, numbness and motor impairment occur in the affected limb. The onset of the disease is rapid and the limb and even life is threatened after the onset of the disease, so early diagnosis and proper treatment in a matter of seconds is essential. Non-cardiac non-cardiac arterial embolism is less common. It mainly includes aneurysm, atherosclerosis combined with ulceration or stenosis, arterial graft, vascular injury, tumor and venous thrombosis, etc. 1.The thrombus attached to the wall of aneurysm is an important source of arterial embolism second only to heart disease: the aneurysms combined with arterial embolism are abdominal aortic aneurysm, femoral aneurysm, aneurysm and subclavian aneurysm, among which aneurysm (25%) and subclavian aneurysm (33%) are the most common complicating arterial embolism. 2, atherosclerotic stenosis combined with thrombosis: often occurs in the aorta or iliac artery, the thrombus block formed is larger, and the diameter of the embolized artery is correspondingly larger. Atherosclerotic plaque surface ulceration, cholesterol crystals into the circulation, can also lead to arterial embolism, embolization of the peripheral arteries with a diameter of 200 ~ 900m, characterized by small emboli, large number, embolism not only block the peripheral vessels, and cholesterol crystals dissolved into the wall of the tube also become inflammatory granulomas, inducing perivascular inflammation, aggravating tissue ischemia. Atherosclerotic cholesterol crystal embolism, which often occurs after arteriography or endoluminal treatment, mostly involves renal arteries, retinal arteries, and peripheral arteries of lower extremities. It manifests as persistent hypertension, renal insufficiency, and blue-toe syndrome or limb cyanosis, for which there is no effective treatment, and drug thrombolysis may be effective. 3, vascular injury: especially the trend of medical injury factors have increased. It is mostly seen in invasive examination and treatment, thrombus on the surface of catheter, even broken guidewire and catheter, which can cause arterial embolism. Other chronic extravascular injuries, such as thoracic outlet syndrome and compression of the subclavian artery by an abnormal cervical rib or 1st thoracic rib, can often produce wall-attached thrombi, which can be a source of emboli for upper extremity arterial embolism. Long-term walking with crutches can also frustrate the axillary artery and lead to wall thrombosis. 4, tumor: mostly seen in primary or metastatic lung cancer, the prognosis is very poor. 5, venous thrombosis: less common, also known as paradoxical embolus, is a venous thrombus dislodged through the unclosed foramen ovale or ventricular septal defect into the arterial system. It is mostly associated with pulmonary embolism and pulmonary hypertension.