Gestational diabetes mellitus is diabetes mellitus in the process of pregnancy, excluding diabetic patients with combined pregnancy, most patients can be after childbirth blood glucose can be normalized, but the chances of developing diabetes mellitus in the future is higher, where the weight of the heavy weight, the age of more than 30 years old, there is a family history of diabetes mellitus pregnant women, should be in the pregnancy of 24-28 weeks of diabetes mellitus screening, 50g of dextrose powder dissolved in 200 ml of water, 5 minutes to serve. The blood glucose value ≥7.8mmol/L one hour after it is positive for sugar screening, fasting blood glucose should be checked, abnormal fasting blood glucose can be diagnosed as diabetes mellitus, and those who have normal fasting blood glucose will then undergo glucose tolerance test (OGTT). Currently, 75g glucose tolerance test is used in China. After 8 hours of fasting, 75g of glucose is taken orally, and the blood glucose is 5.6mmol/L in fasting, 10.0mmol/L in 1 hour, 8.5mmo1/L in 2 hours, and 7.8mmol/L in 3 hours. 2 or more of these two items are at or above the normal value, and gestational diabetes can be diagnosed. Only 1 is above normal and the diagnosis is abnormal glucose tolerance. After the diagnosis of diabetes mellitus, the first step is dietary control, if dietary control is not satisfactory, medication control is needed, the main medication control is insulin therapy, it has not been proved that that one oral drug is safe for diabetes mellitus. The main glycemic control goals for pregnant women are: fasting blood glucose control at 3.3-5.6mmol/L; 2 hours after meal: 4.4-6.7mmol/L; nighttime: 4.4-6.7mmol/L. However, the dietary control of gestational diabetes mellitus, both to ensure that the nutrients and to lower glucose blood glucose, the main energy of its 1800-2000kcal/d, or 30/38kcal/kg/d. Gestational diabetes mellitus to maternal diabetes. kg/d. Gestational diabetes mellitus has far-reaching effects on the mother, fetus, and newborn, and should be given enough attention by each of us.