The normal value of blood glucose for the average elderly 65 years old, if not diagnosed with diabetes, is the same as other age groups, i.e. fasting blood glucose should be 3.9-6.1mmol/L and 2 hours after meal blood glucose ≤7.8mmol/L. Normal people’s blood glucose does not exceed 7.8mmol/L two hours after meal, but it is not the case that blood glucose reaching 7.8mmol/L is diabetes, and patients may have The patient may have abnormal insulin function, but the diagnosis can only be confirmed after medical examination. Generally, fasting blood sugar of 7.8-11.1mmol/L is considered to be hypoglycemia. When the blood sugar exceeds 11.1mmol/L two hours after meal, diabetes may occur and the fasting blood sugar value should be checked. And fasting blood sugar 6.1-7.0mmol/L belongs to impaired fasting blood sugar, if fasting blood sugar ≥7.0mmol/L, plus there are recent symptoms of excessive drinking, excessive eating, excessive urination and unexplained weight loss, then the patient’s diabetes diagnosis is established. If the patient is 65 years old who is diagnosed with diabetes, or at the same time combined with cardiovascular and cerebrovascular complications, such as myocardial infarction, cerebral thrombosis, cerebral hemorrhage, retinal detachment, blindness, or renal insufficiency, amputation, cerebral thrombosis and other limb movement disorders, the value of blood glucose requirement for the patient is different from the standard for young patients or patients with light complications, and fasting blood glucose should be 7.5-8.0mmol/L The fasting blood glucose should be 7.5-8.0mmol/L, the 2-hour postprandial blood glucose ≤10.0mmol/L and glycosylated hemoglobin <6.5% are considered normal. There is no need to strictly control blood sugar in the normal range to prevent hypoglycemia.