Factors were related to GDM include: urban pregnant women (OR=3.62, 95% CI: 1.86 - 7.09), intellectual labor (OR=2.76, 95% CI: 1.35 - 5.65), BMI ≥ 25 (OR=4.92, 95% CI: 2.47 - 9.82), history of gestational hypertention (OR=4.32, 95% CI: 1.60 - 11.72), history of stillbirth (OR=5.61, 95% CI: 1.99 - 15.83) and history of birth defects (OR=26.33, 95% CI: 1.46-475.57).