Whether it is fasting blood glucose or 2 hours postprandial blood glucose, blood glucose 9mmol/L is over the normal range, which may be caused by pre-diabetes, diabetes and other diseases, so it is more serious. The normal range of fasting blood glucose is 3.9~6.1mmol/L, and 2 hours postprandial blood glucose should be less than 7.8mmol/L. Therefore, whether it is fasting blood glucose or 2 hours postprandial blood glucose that exceeds the normal range, it may be caused by pre-diabetes, diabetes, and other diseases. If it is fasting blood sugar 9mmol/L, has reached the diagnostic standard of diabetes, once diagnosed, can be treated by diet control, exercise and application of hypoglycemic drugs, if the blood sugar control is not good there may be complications of diabetes, so it is more serious. If it is 2 hours after meal blood sugar 9mmol/L, generally consider the existence of impaired glucose tolerance, at this time can be controlled by diet control, appropriate exercise methods to control blood sugar, if the control is not good may develop into diabetes mellitus, therefore is also serious. Patients who present with blood glucose 9mmol/L are advised to go to the hospital and ask the doctor to make a judgment.