The normal values for fasting blood glucose are 3.9-6.1 mmol/L, and 2-hour postprandial blood glucose is <7.8 mmol/L. For the elderly, the blood glucose values can be relaxed to keep fasting blood glucose at 7-8 mmol/L and postprandial blood glucose at 10 mmol/L. The goals for different age groups are different. For different age groups, the goal of glycemic control is different. For the elderly, especially those with combined cardiovascular and cerebrovascular disease, blood glucose levels should be relaxed appropriately. If blood glucose control is too strict or blood glucose is too low, it may induce myocardial infarction, cerebral infarction, or even coma, shock and other serious consequences. Therefore, for the elderly population with abnormal blood glucose, they should go to the hospital in time and formulate diet, exercise and medication programs under the guidance of doctors to maintain their blood glucose in a stable range.