Coronary heart disease is one of the most common complications of diabetes, and studies have concluded that postprandial blood glucose levels are better predictors of coronary heart disease than fasting blood glucose. The 2-hour postprandial glucose is a stronger predictor of cardiovascular events than glycated hemoglobin (HbA1c). Postprandial 2-hour glucose is associated with increased cardiovascular mortality, and its predictive value for mortality is superior to that of fasting glucose or HbA1c. Most cardiovascular disease risk factors in diabetic patients and those with impaired glucose tolerance are associated with postprandial hyperglycemic states, and endothelial dysfunction is also the earliest marker of cardiovascular complications in diabetes mellitus. Therefore, effective control of postprandial blood glucose is of great value in reducing and delaying the occurrence and development of diabetic cardiovascular complications. This requires diabetic patients to have a reasonable diet, appropriate exercise, weight control, mood regulation, etc., which is particularly important for controlling postprandial hyperglycemia! Data show that ignoring the detection of postprandial blood glucose and diagnosing diabetes based only on fasting blood glucose, the rate of missed diagnosis is as high as 40% to 80%. Therefore, postprandial blood glucose and fasting blood glucose are equally important for the diagnosis of diabetes. Postprandial blood glucose level, for predicting the occurrence of coronary heart disease has a better role.