If preprandial blood glucose is fasting blood glucose, then preprandial blood glucose 7.7mmol/L postprandial blood glucose 6.7mmol/L is not normal; if preprandial blood glucose is randomized blood glucose, then preprandial blood glucose 7.7mmol/L postprandial blood glucose 6.7mmol/L may be normal. 1. If preprandial blood glucose refers to fasting blood glucose, its normal range is 3.9~6.1mmol/L; if preprandial blood glucose refers to random blood glucose, its normal range is <11.1mmol/l; blood glucose 2 hours after meal should be less than 7.8mmol/L under normal circumstances. 2. Fasting blood glucose of 7.7mmol/l is abnormal, and if it is combined with symptoms such as excessive drinking, excessive eating, excessive urination, weight loss, etc., then it can be diagnosed as diabetes mellitus; random blood glucose of 7.7mmol/l belongs to the normal blood glucose; postprandial blood glucose of 6.7mmol/l is in the normal range, which is normal. 3. If the blood glucose is measured in the same person and at different times, fasting blood glucose 7.7mmol/l postprandial blood glucose 6.7mmol/L is abnormal blood glucose, and diabetes needs to be considered; if the random blood glucose 7.7mmol/l postprandial blood glucose 6.7mmol/L is likely to be normal glucose, and it is recommended to improve the fasting and postprandial blood glucose, to make further judgment. Abnormal blood glucose, should consult the doctor in time, under the guidance of the doctor standardized treatment.