Poor blood circulation in the lower extremities is seen for the following reasons: first, inadequate arterial blood supply, commonly lower extremity atherosclerosis and local plaque formation, and in severe cases, occlusion or even acute embolism. Patients will show pain, numbness, coldness, and even necrosis in severe cases in the distal extremities. Secondly, there are diseases of the venous system, including varicose veins and venous thrombosis, which can affect the blood return to the distal veins. Patients will show pain, swelling, and in severe cases, also venous gangrene and even obvious tension blisters, so the limb should be elevated for active symptomatic treatment such as improving microcirculation. In the case of atherosclerotic occlusive disease, the underlying disease should be treated, blood pressure changes should be monitored, and lower extremity arterioplasty may also be performed if necessary. During the perioperative period, attention should also be paid to the administration of vasodilators and a low-salt, low-fat diet.