Keep the feet clean: patients with diabetic foot necrosis will have extremity pain and temperature perception disorder, it is advisable to soak the feet (non-affected side) with warm water every night before bed, the water temperature should not be high, 10-15 minutes each time, after washing, the toe gap should be gently wiped dry. Nails should be cut once a week to prevent infection from scratching the skin. Local treatment: first of all, pus should be collected and sent to bacterial culture and drug sensitivity test in order to select sensitive antibiotics. For foot necrotic tissue should be removed in stages to keep the wounds and incisions draining smoothly. Infected wounds must be scrubbed with 0.1% chlorhexidine and 3% hydrogen peroxide and changed once a day, and no exception is made for small non-infected wounds. Topical application of 654-2 should be used to improve microcirculation. It is advisable to elevate the affected limb normally to facilitate blood return. Dietary care: Calculate the total daily calories according to the ideal weight of the patient. Patients with diabetic foot necrosis should be appropriately enhanced by 10%-20% of calories due to high consumption of infection, and at the same time, the recipes should be diversified according to the patient’s dietary habits. It is necessary to eat regularly and quantitatively, and this is especially true for those who inject insulin. Psychological care: diabetic patients often have low self-esteem due to foot gangrene with bad odor, in addition, some are prone to anxiety due to longer hospital stays. Family members and doctors should be more comforting, more encouragement, timely guidance, so that patients are stable and cooperate with treatment.