Patients diagnosed with gestational diabetes mellitus at 24-28 weeks of gestation with a fasting blood glucose ≥5.1 mmol/L need to be considered for insulin therapy. Gestational diabetes mellitus can be diagnosed at 24-28 weeks of gestation and after 28 weeks of gestation if any one or more of the following blood glucose values are met: fasting blood glucose ≥5.1mmol/L, 1h blood glucose ≥10.0mmol/L after taking 75g of glucose, 2h blood glucose ≥8.5mmol/L. Once the diagnosis of gestational diabetes mellitus is confirmed, it is necessary to use insulin hypoglycemic treatment under the guidance of the doctor, and at the same time to control the diet and exercise appropriately, and monitor blood glucose on a regular basis.