The normal fasting blood glucose for 75-80 year olds is 3.9-6.0mmol/L, and the 2-hour postprandial blood glucose is less than 7.8mmol/L. For elderly people suffering from diabetes, the goal of glycemic control is generally fasting blood glucose of 4.4-7.0mmol/L, and non-fasting blood glucose of 10.0mmol/L, which can be appropriately relaxed according to their own situation. Clinically, the normal range of fasting blood glucose is 3.9-6.0mmol/L, and the normal 2-hour postprandial blood glucose is less than 7.8mmol/L. For patients with diabetes mellitus, the glycemic target is generally fasting blood glucose 4.4L-7.0mmol/L, and non-fasting blood glucose is not more than 10.0mmol/L. Because elderly diabetic patients have high risk of hypoglycemia and poor ability to perceive hypoglycemia, it is not easy to detect hypoglycemia after it occurs, so the glycemic control target should be relaxed appropriately. 75 to 80 years old and above, especially those with complications and concomitant diseases and poor self-management ability, the glycemic requirement can be relaxed appropriately to prevent hypoglycemia. Elderly people are advised to seek timely medical examination when their blood glucose is abnormal.