Objective To understand the anxiety， depression and social support of gestational diabetes mellitus（GDM） women in perinatal nutrition clinic in Beijing. Methods In accordance with the representative method of stratified random sampling， extraction， comprehensive urban suburban hospital， a total of 456 pregnant women with GDM who were diagnosed for the first time in perinatal nutrition clinic at 24-28 gestational weeks in January to August， 2016 were selected in this study for questionnaire survey. Survey included questionnaire on general information， Self-rating Anxiety Scale（ SAS）， Self-Rating Depression Scale（ SDS） and Social Support Scale. The results were statistically analyzed. Results The SAS score of pregnant women with GDM was（ 57.12±4.61）， SDS score was（ 59.62±4.38）. Anxiety and depression of GDM patients were negatively correlated with social support utilize degree， social support scores and subjective support（ P＜0.05）. Elderly primipara， pre-pregnancy BMI≥25kg/m2， higher education， adverse pregnancy， living in the city were risk factors of the occurrence of anxiety and depression in pregnant women with GDM. However， social support was a protective factor. And the social support of GDM pregnant women who lived in country was lower. Conclusions Pregnant women with GDM are easy to be anxiety and depression. It is suggested that health education classes should be set up in perinatal nutrition clinic to provide psychological guidance and strengthen social support to pay attention to mental health of pregnant women with GDM.