A two-hour postprandial blood glucose of about 9 mmol/L, which is above the normal range of two-hour postprandial blood glucose, may be caused by an abnormal glucose tolerance, and if it is not well controlled, it may develop into diabetes mellitus, and is therefore more serious. The normal range of two-hour postprandial blood glucose should be less than 7.8 mmol/L, so a high two-hour postprandial blood glucose of 9 mmol/L may be caused by abnormal glucose tolerance. If the blood sugar control is not good, it may develop into diabetes, so it is more serious and needs to be actively controlled. It is necessary to do a good job of dietary management under the guidance of the doctor, such as restricting the total calorie intake, and appropriate aerobic exercise such as jogging, swimming, and jumping rope. Patients presenting with a two-hour postprandial blood glucose of 9 mmol/L are advised to go to the hospital and ask the doctor to make a judgment.