The normal range of two-hour postprandial blood glucose is less than 7.8 mmol/L. When the two-hour postprandial blood glucose is between 7.8 and 11.1 mmol/L, it belongs to abnormal glucose tolerance, which is the stage of impaired glucose regulation, and is diagnosed as pre-diabetes. When the two-hour postprandial blood glucose is greater than 11.1mmol/L, it can be diagnosed as diabetes, which needs to be confirmed by rechecking blood glucose at another different time. As long as the two-hour postprandial blood glucose is more than 7.8 mmol/L, it is necessary to recheck fasting blood glucose and glycated hemoglobin, and to treat diabetes with diet and exercise. When the diet and exercise treatment cannot make the blood glucose reach the standard, it is necessary to treat with glucose-lowering drugs under the guidance of the doctor. For diabetic patients under treatment, a two-hour postprandial blood sugar of no more than 10.0 mmol/L is sufficient.