A two-hour postprandial blood glucose of 7.3 mmol/L is normal, and a two-hour postprandial blood glucose of less than 7.8 mmol/L is normal. If the two-hour postprandial blood glucose is >7.8mmol/L, the patient is recommended to undergo the screening of oral glucose tolerance test, and the patient’s glucose metabolism status will be clarified according to the screening results of oral glucose tolerance test. According to China’s epidemiological study, if only checking the fasting blood glucose, the rate of diabetes leakage is high, so it is necessary to test the fasting blood glucose, the blood glucose two hours after the oral glucose tolerance test, and the level of glycated hemoglobin at the same time, in order to improve the diagnosis of diabetes mellitus. People at high risk for diabetes should be aware of and participate in diabetes prevention and treatment and should be screened on a regular basis.