During pregnancy by blood glucose will change, but pregnant women who measure their own blood glucose at home 2 hours after meal 3.7 mmol / L is within the normal range, should continue to keep testing. In pregnancy, the mother’s body to adapt to the changes, will increase the intake of glucose, glomerular filtration increases, the rate of glucose clearance by insulin increases, the mother’s glucose transfer to the fetus, these will lead to pregnant women fasting blood glucose is lower than non-pregnant. At the same time the placenta secretes hormones that inhibit the action of insulin. Generally speaking, the normal value of fasting blood glucose for pregnant women is 3.1~5.1mmol/L; the normal value of blood glucose 2 hours after meal is lower than 8.5mmol/L. Therefore, 3.7 2 hours after meal for pregnant women belongs to the normal range. Attention should be paid to the monitoring of blood glucose during pregnancy to avoid causing gestational diabetes, which may have serious effects on the mother and child.