There is no limit to the maximum number of years a diabetic patient can live if he or she undergoes amputation for diabetic foot, it is possible to live more than 10-20 years if the condition is well controlled, but if the condition is poorly controlled it is possible that life may end in a few weeks or even months. Therefore, the whole life expectancy of diabetic patients after amputation must be directly related to the control of the patient’s condition, there is no doubt about it, but of course, it must be noted that diabetic patients after amputation are greatly restricted in exercise. Therefore, it is unrealistic to expect to control blood glucose through exercise therapy, and it is necessary to use hypoglycemic drugs, especially insulin therapy, under the guidance of a doctor to control blood glucose at an ideal level and to minimize the occurrence of hypoglycemia, including acute complications, in order to delay life expectancy to the greatest extent possible, and to live a relatively long time if it is well controlled.