Generally, pregnant women are recommended to have blood sugar <5.1mmol/L in fasting. If it is higher than this value for several measurements, it means that blood sugar is elevated during pregnancy and needs to be controlled in time. If it is higher than 8-9mmol/L for a long time, it will cause congenital kidney and heart function disability of the fetus. If the blood sugar level of pregnant women exceeds 10mmol/L for a long time, the chance of the fetus having multiple organ developmental malformations will increase, and the function of the pregnant women's own multiple organs will also be affected. Therefore, it is necessary to measure blood glucose in time, eat more green plants, eat more food with less sugar, exercise properly and go to the hospital for review in time. However, this value is only an average value, not an absolute value, and each pregnant woman should be treated individually according to her situation.