Gestational diabetes mellitus was diagnosed at 34 weeks of pregnancy with an abnormal fasting blood glucose of 6.3 mmol/L. 75g OGTT (Oral Glucose Tolerance Test) was performed at 24-28 weeks of gestation and at the first visit after 28 weeks. Diagnostic criteria for 75g OGTT: Fasting and 1 hour and 2 hours after taking glucose, the blood glucose value is lower than 5.1mmol/L10.01mmol/L, 8.5mmol/L. Any blood glucose value that reaches or exceeds the above criteria is diagnosed as gestational diabetes mellitus. The impact of gestational diabetes on the mother and child and its extent depends on the condition of the diabetes and the level of glycemic control. If the disease is severe or the glycemic control is poor, the impact on the mother and child is great, and the mother and child have a higher level of near- and long-term complications. Gestational diabetes can adversely affect both mother and child, so when a pregnant woman suffers from this disease, she should go to the hospital in time. Pregnant women should pay attention to the prenatal examination during pregnancy, actively listen to the advice of professional doctors to do a comprehensive nursing care, pay attention to rest, at the same time should relax, avoid tension, anxiety, any discomfort should be timely to the hospital, by the doctor to clarify the diagnosis, and cooperate with the doctor to deal with the symptoms.