The normal range of 2-hour postprandial blood glucose is <7.8 mmol/L. A 2-hour postprandial blood glucose of 4.5 mmol/L is within the normal range and is generally not serious. The normal range of blood glucose corresponding to normal people when fasting is 3.9~6.1 mmol/L, and the blood glucose value corresponding to 1 hour after meal is 6.7~9.4 mmol/L, and the maximum is not more than 11.1 mmo/L; the blood glucose value of 2 hours after meal should be <7.8 mmol/L. And diabetic patients 2 hours after meal blood glucose is generally required to control <10mmol/L, 2 hours after meal blood glucose 4.5mmol/L, belongs to the blood glucose control is better, generally is not high. Diabetic patients should follow the doctor's advice to control their diet, moderate exercise and regular medication to keep their blood glucose level within the target range. If diabetic patients have abnormal blood glucose values, they should go to the hospital in time to avoid delaying their condition.