Oral hypoglycemic drugs can affect fetal development, so gestational diabetes should not be treated with oral hypoglycemic drugs. Gestational diabetes is diabetes found during pregnancy, most often diagnosed during an oral glucose tolerance test at 20-24 weeks of pregnancy. The treatment of gestational diabetes involves diabetic diet and exercise, and subcutaneous insulin injections can be given once a day, twice a day, three times a day, or four times a day, depending on the patient’s blood glucose, under the direction of a doctor. According to the patient’s blood glucose, diet and weight, the insulin dosage should be adjusted in time to keep the fasting blood glucose lower than 5.3mmol/L, the blood glucose one hour after meal lower than 7.8mmol/L, and the blood glucose two hours after meal lower than 6.7mmol/L, so as to minimize the damages of high blood glucose to the fetus and the pregnant mother, and to reduce the occurrence of various adverse pregnancy outcomes.