Abstract: Abstract Objective : To investigate the risk factors of gestational diabetes mellitus and provide the basis for intervention. Methods: The method of 1:2 matched case-control study was used to study the risk fators of gestational diabetes mellitus.The chi-square test was used in univariate analusis and Logistic regression was used in multivariate analusis. Results: The odd ratio and 95% confidence interval of education levels, pre-pregnancy BMI, pregnancy waist, pregnancy waist hip ratio, family history of diabetes and family history of hypertension were 1.829 (1.250-2.057), 1.589 （1.247-1.900）, 2.197 （1.110-4.349）, 2.238 （1.798-3.920）, 3.015 （1.851-5.192）, 2.824（1.621-4.596）.Conclusions: The risk factors of gestational diabetes mellitus were education levels, pre-pregnancy BMI, pregnancy waist, pregnancy waist hip ratio, family history of diabetes and family history of hypertension. So people with those should be intervened firstly.

Key words: gestational diabetes mellitus, case-control study, risk factors