Impaired glucose tolerance or diabetes mellitus that occurs or is first discovered during pregnancy is gestational diabetes mellitus, which is likely to lead to risks such as abnormal fetal development, neonatal malformation, macrosomia and neonatal hypoglycemia. Therefore, blood sugar must be strictly controlled to ensure the healthy development of the fetus. Conditioning methods are: 1, reasonable diet, eat less and eat more meals, avoid fried, sweet and irritating food, drink less porridge and stuff food; 2, appropriately increase the amount of exercise, insist on 45-60 minutes every day and persevere, mainly taking a walk to avoid strenuous exercise; 3. Check blood sugar regularly; 4. Inject insulin for treatment if necessary.