Glucose tolerance test is required for pregnant women in the middle of pregnancy, the purpose of the test is to clarify the presence of gestational diabetes. The glucose tolerance test includes not only fasting blood glucose, but also one hour after meal and two hours after meal. Not all gestational diabetes will have preprandial blood glucose elevation, some have predominantly postprandial blood glucose elevation, so it is necessary to improve the test. The glucose tolerance test is performed by taking glucose orally and measuring the fasting, one-hour and two-hour postprandial blood glucose. If abnormalities in blood glucose are detected through the test, it is necessary to see if medication is needed under the guidance of a professional doctor according to the blood glucose situation, but diet and exercise must be carried out.