Human blood glucose is not a fixed value, due to physiological and pathological factors can be elevated, and affected by their own and external factors fluctuating state, two-hour postprandial blood glucose 7.9mmol / L is normal or not, it should be analyzed according to the different groups of people. Normal people: If the normal people have a two-hour postprandial blood glucose of 7.9mmol/L, it is necessary to pay attention to whether there are some stress factors, including eating a large amount of carbohydrates, or strenuous exercise, or there are infections, surgeries, pregnancies and other conditions, these factors may cause a slight increase in the two-hour postprandial blood glucose, and the blood glucose can be restored to normal after the removal of the causative factors, which is called transient hyperglycemia. This is called transient hyperglycemia. Transient hyperglycemia is not true diabetes and requires further investigation. The normal range of two-hour postprandial blood glucose is 7.8mmol/L or less. In the absence of diabetes diagnosis, if a normal person has several episodes of two-hour postprandial blood glucose of 7.8mmol/L or more, and at the same time, less than 11.1mmol/L, the possibility of impaired glucose tolerance will be considered. Second, the diabetic population: if the diabetic patient two hours after meal blood glucose 7.9mmol / L, especially the elderly diabetic patients, it suggests that the patient’s current blood glucose control standard. At this time should measure the value of glycated hemoglobin, if this time in 6.3mmol / L, suggests that the patient’s current treatment program is correct, you can continue in accordance with the current treatment program.