There is no way to accurately predict how long a diabetic patient can live, because diabetes in a well-controlled state can effectively avoid complications, which has little impact on life expectancy, but if blood glucose control is poor, it can be life-threatening due to a variety of complications, but there is no specific time statistics. If blood glucose control is poor, the patient’s whole body systems and organs, can appear different degrees of damage, such as diabetes mellitus common chronic complications including retinopathy, cardiovascular and cerebrovascular disease, peripheral vascular disease, renal disease, etc., in severe cases, can be multi-organ failure, serious metabolic disorders and even death. Diabetic patients’ blood glucose control can be controlled by controlling diet, reasonable taking drugs or subcutaneous injection of insulin, blood glucose control is good, at this time does not cause metabolic disorders in the body, patients can live a normal life, does not affect the life expectancy. Therefore, when diabetes occurs, it is recommended to go to the hospital, must be through the active treatment of lowering sugar and life diet, exercise regulation, good control of blood glucose, prevention and delay the emergence of complications.