High postprandial blood glucose in pregnant women may be related to the increased secretion of hormones that antagonize insulin. In the middle and late stages of pregnancy, the secretion of insulin-antagonistic glucagon increases, such as estrogen, progesterone, placental lactogen, etc., which makes pregnant women less sensitive to insulin and need to secrete more insulin in order to maintain normal blood glucose, and if the pregnancy is not able to compensate for this physiological change, this will lead to high postprandial blood glucose. Generally, glucose tolerance test is performed at 24-28 weeks of pregnancy and after 28 weeks, if fasting blood glucose is greater than or equal to 5.1mmol/L or 1h blood glucose is greater than or equal to 10.0mmol/L or 2h blood glucose is greater than or equal to 8.5mmol/L after taking 75g glucose, gestational diabetes mellitus is considered. Pregnant women with high postprandial blood glucose should go to the hospital in time and be treated under the guidance of the doctor.