The main reference for blood glucose value of pregnant women is glucose tolerance test, and the normal value is fasting blood glucose <5.1㎜ol/L, and blood glucose one hour and two hours after taking sugar <10.0㎜ol/L and 8.5㎜ol/L respectively. The normal value of blood glucose during pregnancy is lower than that during non-pregnancy, and the reference standard of its normal value is glucose tolerance test, i.e., it should not be more than 5.1 ㎜ol/L during fasting, 10.0 ㎜ol/L one hour after taking glucose, and 8.5 ㎜ol/L two hours after taking glucose, and once one of the indexes exceeds the normal value, it belongs to gestational diabetes mellitus. If blood glucose meets the above standard, there is no need for special intervention. If the blood glucose is found to be high, the lifestyle should be corrected, such as eating less high-calorie and high-fat food, eating more coarse grains and vegetables, and exercising appropriately, which can improve the abnormalities of glucose tolerance. However, if blood glucose is too high and cannot be corrected by lifestyle intervention, insulin therapy should be chosen if necessary to avoid more serious complications. A pregnant woman during pregnancy should pay attention to do a good job of prenatal checkups, and actively listen to the advice of professional doctors to do a good job of comprehensive care and health care work, can effectively ensure the safety of the birth.