The blood sugar of gestational diabetes patients two hours after meal should be controlled below 7mmol/L, that is, between 5 and 7mmol/L is the best, more than 7mmol/L means that the blood sugar control is still not ideal, and it has an impact on the development of the fetus, so the diet should be strictly controlled. In addition, insulin can be used to lower blood sugar when necessary. If the blood sugar is lower than 5mmol/l two hours after meal, it will increase the risk of hypoglycemia in pregnant women, and like hyperglycemia, hypoglycemia will also affect the development of the fetus, especially the brain development. Pregnant women should closely monitor the two-hour postprandial blood sugar during pregnancy, at least 1-2 times a day, 3-4 times a week, and adjust the diet and treatment plan in time according to the blood sugar situation.