Eighty-year-old postprandial blood glucose more than 30 mmol / L can live for how long there is no clear data statistics, individual differences are large, need to be combined with specific conditions to determine, high blood glucose is prone to diabetic ketoacidosis and other serious complications, will be relatively shorten the patient’s survival period. Postprandial blood glucose more than 30 mmol / L is prone to induce diabetic ketoacidosis, hyperosmolar coma, lactic acidosis, cardiovascular emergencies and other serious complications, is very likely to produce adverse consequences, should be sent to the emergency room in a timely manner, the specific how long to live according to the condition of judgment. Elderly patients with hyperglycemia should follow the doctor’s instructions to standardize the use of hypoglycemic drugs, such as metformin, or injection of insulin therapy, good dietary control, appropriate exercise, to maintain blood glucose within a reasonable range. Elderly diabetic patients with postprandial blood glucose of more than 30 mmol/L should actively cooperate with the doctor’s treatment and maintain a healthy lifestyle, which will help improve the prognosis.