Glucose tolerance screening is a necessary program for 24-28 weeks of pregnancy. Glucose tolerance screening helps to detect gestational diabetes, which can have many adverse effects on the pregnant woman and the fetus. Pregnant women can suffer preterm labor, miscarriage, infections, gestational hypertension, placental abruption, and other hazards due to high blood sugar. Fetuses exposed to prolonged maternal hyperglycemia can lead to macrosomia, fetal growth restriction, intrauterine hypoxia, and intrauterine fetal death, among other effects. Glucose tolerance screening can detect abnormal glucose tolerance in pregnant women in time and intervene early to prevent a series of complications arising from high blood sugar in pregnant women and fetuses.