Diabetic foot is a serious and terrible chronic complication of diabetes and a major cause of disability, death and incapacitation in diabetic patients. It is a symptom of ischemia and necrosis of the limb due to vascular lesions, neuropathy and metabolic disorders caused by long-term hyperglycemia in diabetic patients. Therefore, early detection and treatment is especially important. 1, intermittent claudication: lower limb ischemia makes the muscle blood supply insufficient, and after walking for a certain distance, the lower limb is weak, tired and numb, and in heavy cases, the calf muscle pain, stop walking, and the symptoms can be relieved after rest, which is the early manifestation of ischemia. 2. Rest pain and nocturnal pain: rest pain is caused when lower limb ischemia is aggravated, because the blood transfusion of the heart decreases during sleep and the perfused blood volume of lower limb is also the least, the pain is often aggravated at night, so it is called rest pain and nocturnal pain. 3. Arterial pulsation: the pulsation of dorsal foot and posterior tibial artery is weakened, and in severe cases, the pulsation disappears. 4. Sensory numbness, tingling, burning pain or loss of sensation in the hands and feet: usually due to neuropathy, but sudden arterial blockage can also cause loss of sensation in the lower extremities. 5, skin manifestations: skin malnutrition, dry, sweatless, brittle or inelastic, skin temperature drops, hair loss, due to lack of nutrition of skin and subcutaneous tissue, making the skin thin and pale, and subcutaneous tissue is obviously depleted, which indicates that poor arterial blood supply has lasted for a long time. 6, the foot drops when purple: foot drops, if the foot is purple, suggesting that the blood circulation is very poor, so that the foot microvascular expansion, and because the arterial blood pressure is very low, the blood flow is slow, the color of blood through the thinner skin, so that the skin of the foot is purple, then if the lower limb is raised for 30-60 seconds, see the back of the foot is obviously pale, followed by the limb drops to see the foot is purple. 7, bone and muscle changes: muscle atrophy, flexor and extensor muscles lose the normal balance of traction tension, interphalangeal joint bending to form bowed feet, claw-like toes and other foot deformities, X-ray examination can be seen in bone destruction, bone fragments, dead bone, bone decalcification and other changes in diabetic patients accounted for 52.7%. The above-mentioned risk factors should be actively prevented and corrected, and once detected, should be actively treated. Avoid the development of diabetic foot.