The normal range of 2-hour postprandial blood glucose is 3.9~7.8mmol/l. The 2-hour postprandial blood glucose value is affected by a variety of aspects, there will be a certain range of fluctuation, such as pregnant women 2-hour postprandial blood glucose value may be on the high side, but the normal value does not exceed the critical value of 8.5mmol/l. Diabetic patients with 2-hour postprandial blood glucose below 3.9mmol/l are considered to have hypoglycemia; normal people with 2-hour postprandial blood glucose below 2.8mmol/l are also considered to have hypoglycemia, and need to be given glucose supplementation in a timely manner to restore blood glucose to normal, and repeated monitoring of blood glucose changes. If the 2-hour postprandial blood glucose is between 7.8~11.0mmol/l, it is considered as pre-diabetes, that is, reduced glucose tolerance, which indicates that the patient’s glucose metabolism has begun to have problems, and need to diet and exercise to control the intake of carbohydrates, and regular monitoring of blood glucose. If the 2-hour postprandial blood glucose is greater than 11.0mmol/l, then it is considered that diabetes may exist, and it is necessary to combine with clinical symptoms and fasting blood glucose, random blood glucose and other further tests to clarify the diagnosis. After the diagnosis of diabetes mellitus is confirmed, hypoglycemic treatment is needed, and regular blood glucose monitoring, combined with diet and exercise, and medication adjustment according to the blood glucose monitoring situation.