A pregnant woman with a glucose tolerance of 12 mmol/L in one hour is more serious and is considered gestational diabetes, and intervention is recommended as soon as possible. Pregnant women without a diagnosis of diabetes before pregnancy are usually tested for glucose tolerance at 24 to 28 weeks of gestation. Fasting blood glucose value ≥5.1mmol/L, or 1 hour after meal blood glucose ≥10.0mmol/L, or 2 hours after meal blood glucose value ≥8.5mmol/L, satisfy any one of them is gestational diabetes. So pregnant women with glucose tolerance one hour blood glucose 12mmol / L, has reached the diagnostic criteria for gestational diabetes mellitus, it is recommended to consult a doctor in time for treatment. The treatment of gestational diabetes mellitus is based on dietary control and appropriate exercise, with insulin injection if necessary. Pregnant women with glucose tolerance one hour blood glucose 12mmol / L, it is recommended to go to the hospital in a timely manner, early formal treatment.