In general, patients with diabetes who have been ill for 20 years have many complications, such as brainstem infarction, hemiplegia and diabetic gangrene, of which gangrene is a very serious skin ulcer, and many hospitals will recommend amputation if treatment is not effective. How to treat diabetic rotten feet effectively is a matter of concern, and treatment should be based on the specific symptoms of the patient, which includes many aspects, such as limiting activity, reducing weight, and to promote the return of blood to the lower extremities to raise the affected limb too high, which can also reduce edema. In addition, it is fundamental to control blood glucose to prevent complications from worsening, so a strict program should be developed to help patients lower their sugar. Minimize the adverse effects of hypoproteinemia and heart, brain, and kidney complications on gangrene healing. Emphasize the debridement process in patients with diabetic gangrene by combining local debridement with overall debridement, complete removal of necrotic tissue, placement of drainage, and routine disinfection and dressing changes on time. In addition, it is important to help patients build confidence in overcoming the disease, educate them regularly, and provide reasonable foot care during the day so that sub ah can truly prevent external injury and contribute to early recovery.