Gestational diabetes mellitus is diagnosed at 24-28 weeks of pregnancy when the fasting blood glucose level exceeds 5.1 mmol/L, the blood glucose level one hour after glucose loading exceeds 10 mmol/L, and the blood glucose level two hours after glucose loading exceeds 8.5 mmol/L. The diagnosis of gestational diabetes mellitus is confirmed by the need for insulin. The treatment of gestational diabetes mellitus includes dietary treatment and medication. Diet should strictly control the total calorie intake and avoid high-sugar foods, while medication is mainly insulin treatment, and the specific amount of treatment should be in accordance with the doctor’s prescription. Patients with gestational diabetes are advised to consult the endocrinology department of regular hospitals for treatment under the guidance of doctors.