Patients with diabetic foot often have the following symptoms: 1. The skin of the patient’s extremity is dry and sweatless, dark in color, and sweat hair is lost. 2, the patient extremity tingling, burning pain, numbness, dullness or loss of sensation, cold feeling. Patients often have weakness when walking, no energy under the feet, like stepping on cotton, and have to rest for a while before they can walk again, which we call intermittent claudication, and if the disease develops seriously, the feet hurt even if they don’t walk, which is the so-called resting pain. The skin of the patient’s extremities is dry, cracked, blistered, eroded, ulcerated, gangrenous or necrotic. Many patients often do not pay enough attention in the early stage, or do not know where to go to see a doctor, the development of the disease, the foot will appear to varying degrees of rupture, skin necrosis. The following are common: 1. Wet gangrene occurs mostly in the extremity of the arterial and venous blood flow is simultaneously blocked, circulatory and microcirculatory disorders and neurotrophic disorders, accounting for about 2/3. soft tissue infection of the limb vesicles and pus, forming severe gangrene. Localized redness, swelling, heat, pain, and dysfunction, even with systemic symptoms. 2, dry gangrene occurs mostly in the limb atherosclerosis, narrowing of the vascular cavity or arterial thrombosis, interruption of blood flow, but the venous return flow is smooth and tissue fluid is reduced. Ischemic necrosis at the end of the limb is dry and black, with clear necrotic boundaries. 3, mixed gangrene occurs more in a part of the limb arterial or venous obstruction, poor blood flow and infection, accounting for about 20%. Wet gangrene and dry gangrene of both types exist in the same area.