The incidence of gestational diabetes is increasing year by year, and it is very important to do a good job in preventing gestational diabetes in high-risk groups. Clinically, the high-risk groups for gestational diabetes include the following: 1. Pregnant women older than 35 years of age. Women with pregnancies over 35 years of age are of advanced maternal age, and all obstetric complications are significantly higher in advanced maternal age. Therefore, it is recommended that women choose to have a pregnancy before the age of 35 if possible. 2. Women who are obese before pregnancy have a much higher chance of developing gestational diabetes after pregnancy. 3. Women with a family history of diabetes. Diabetes can run in families, so pregnant women with a family history of diabetes are vulnerable to gestational diabetes. 4. Pregnant women with previous adverse pregnancy outcomes. Among the adverse pregnancy outcomes include miscarriage, preterm birth, stillbirth, gestational diabetes, etc. 5. Pregnant women with abnormalities in the current pregnancy. The chance of developing gestational diabetes is greatly increased when a pregnant woman has recurrent episodes of vulvovaginal mycosis, excessive amniotic fluid, or a large fetus during the current pregnancy. It is recommended that eligible pregnant women pay attention to the fact that they are at high risk for gestational diabetes.