The “diabetic foot” is defined as a foot with loss of vitality due to ischemia and loss of sensation due to neuropathy, combined with infection. It is a serious diabetic complication that is highly disabling and fatal. Patients with diabetic foot often have a poor prognosis with the ultimate outcome: ulceration, amputation and death. The diabetic foot accounts for approximately 12.13% of hospitalized diabetic patients, and its amputation rate is as high as 50%. Therefore, the treatment of diabetic foot is much more than the need for strict glycemic control; it urgently requires aggressive treatment from vascular surgery, including surgical removal of necrotic tissue, drainage of pus, and revascularization surgery. Especially when diabetic patients have foot infections, redness, swelling, ulcers, gangrene, surgical treatment is urgent! Otherwise, the patient will likely face the threat of amputation! Diabetic foot ischemia is mostly caused by arterial stenosis or occlusion, and previous studies have concluded that all diabetic foot vascular lesions are microangiopathy. This concept is now found to be wrong. It is now clear that the majority of diabetic foot vascular lesions are located in the arteries of the lower leg, namely the anterior tibial artery, posterior tibial artery or peroneal artery, and vascular surgery can be performed to improve the blood supply to the foot, so that the diabetic foot can be effectively treated and high level amputation can be avoided. Therefore, for the treatment of diabetic foot, vascular surgery is routinely required to evaluate the degree of vascular lesions and determine the choice of major treatment methods, such as whether lower extremity arterial revascularization (commonly known as bypass surgery) is required. Numerous clinical studies have confirmed that distal lower extremity arterial bypass is the primary choice for diabetic foot patients to avoid high level amputation.