Normal 2-hour postprandial blood glucose should be <7.8mmol/L, ≥7.8mmol/L is abnormal glucose tolerance or diabetes. Normal human body has the function of regulating blood glucose. When eating intake of sugar, blood glucose slightly elevated, insulin will play a hypoglycemic effect, so that blood glucose fluctuations within a certain range, not too much elevation. Generally, blood glucose peaks at 0.5~1 hour after meal, then blood glucose gradually decreases and should return to normal at 3 hours after meal. Normal blood glucose should be <7.8mmol/L 2 hours after meal. When the body's blood glucose regulation function is abnormal, abnormal glucose tolerance and diabetes will occur. When the 2-hour postprandial blood glucose is 7.8~11.1mmol/L and the fasting blood glucose is <7.0mmol/L, it is abnormal glucose tolerance, which can be seen in hyperthyroidism, diabetes mellitus type 2. If 2-hour postprandial blood glucose ≥11.1 mmol/L should be alerted to diabetes mellitus. Patients are advised to compare the normal range of 2-hour postprandial blood glucose, and if abnormal 2-hour postprandial blood glucose occurs, they should consult the doctor promptly for further examination and treatment as prescribed by the doctor.