For the normal range of blood glucose in middle-aged people, the evaluation of whether a person’s blood glucose is normal is based on venous plasma glucose. Generally, the venous plasma glucose of fasting is less than 6.1mmol/L in normal people, provided that the fasting time is more than 8 hours. Two hours after the meal of venous plasma glucose, normal people less than 7.8mmol / L, here refers to the meal is no matter what kind of food, normal people will reach less than 7.8mmol / L. If the fasting blood glucose is greater than 6.1mmol / L, but less than 7.0mmol / L, suggests that the patient may be in the pre-diabetes. If the blood glucose two hours after a meal is ≥ 7.8 mmol/L and less than 11.1 mmol/L, it also suggests that it is in pre-diabetes and requires vigilance that it may develop into diabetes in the future.