Normal pregnant women’s blood glucose value 2 hours after meal should be less than 6.7mmol/L, and more than 8.5mmol/L can be diagnosed as gestational diabetes. After pregnancy, insulin secretion of pregnant women increases, while insulinase produced by the placenta will antagonize insulin, resulting in a relative lack of insulin secretion, which can lead to postprandial hyperglycemia in pregnant women and favor the supply of fetal sugar. During pregnancy, pregnant women eat more than before pregnancy, and their nutrient intake increases. If insulin secretion is affected, it can easily lead to elevated blood glucose during pregnancy, which can lead to gestational diabetes. If the blood glucose is too high during pregnancy, it will have serious effects on the pregnant woman and the fetus, so it needs to be taken seriously. During pregnancy, pregnant women should control their diet properly, do not overeat, eat less sweets, and be properly active to keep their blood sugar within the normal range during pregnancy.