Glucose tolerance of pregnant women only one hour high is important, need to control blood glucose under the guidance of physicians. Gestational diabetes mellitus (GDM) is diagnosed when any point reaches or is higher than the above standard. Therefore, GDM should be diagnosed when the glucose tolerance is high for only one hour, and blood glucose should be controlled according to the doctor’s instruction. Gestational diabetes mellitus can increase the risk of gestational hypertension, macrosomia, fetal distress and other pregnancy risks, so once defined should follow the doctor’s advice strict diabetic diet, and assisted by postprandial exercise to control blood glucose changes, but if the effect of diet and exercise to control blood glucose is not good, you need to follow the doctor’s advice to give insulin to control blood glucose, in order to reduce the risk of pregnancy, to ensure the safety of mothers and babies.