The internationally recognized gold standard for evaluating how well diabetes is controlled is glycated hemoglobin, and glycation is affected by both fasting and postprandial blood glucose, so to see the effect of fasting blood glucose and postprandial blood glucose, it is mainly to see the effect on glycated hemoglobin. A study found that when glycated hemoglobin is 7.3%~8.4%, the effect of fasting and postprandial blood glucose on overall blood glucose is roughly comparable, and the intensity is 50% each: when glycated hemoglobin is greater than 8.5%, it shows that the effect of fasting blood glucose on overall blood glucose is greater than postprandial blood glucose, and with the increase of HbA1c, the effect of fasting blood glucose on glycated hemoglobin will also increase; when glycated hemoglobin is less than When glycosylated hemoglobin is less than 7.3%, the effect of postprandial blood glucose on overall blood glucose is greater than that of basal blood glucose, which means that the increase of blood glucose mainly depends on postprandial blood glucose. Of course, it has been proved that postprandial blood glucose is an independent risk factor for cardiovascular disease death, and strict control of postprandial blood glucose will be more conducive to control to the standard, so that the structure and function of vascular endothelial cells can be better protected and the death rate of cardiovascular complications can be reduced. Obviously, the impact of fasting blood glucose and postprandial blood glucose on overall blood glucose control is equally important.