Abstract:Objective To explore the relationship between social support and pregnancy depression in Shenzhen. Methods During August 2018 and June 2020, a structure questionnaire survey was conducted among pregnant women who underwent pregnancy examination in a third-grade maternal and child health care hospital. A total of 1396 questionnaires with complete information were collected. Chi-square test and Wilcoxon rank sum test were used to analyze the baseline characteristics. The odds ratio (OR) and 95%CI confidence interval between social support and pregnancy depression were estimated using logistics regression model. subgroup analysis was also conducted. Results There were statistically significant differences in education level, medical insurance rate, household registration, family monthly income, proportion of pluripara, husband being the only child, pregnancy stress and social support between depression group and non-depression group. After multi-factors adjustment, the OR (95%CI) of the total social support score was 0.97(95%CI 0.95-0.99), the OR (95%CI) of the objective support dimension was 0.90(95%CI 0.87-0.94), and the P value of the interaction term multiplied by pregnancy term was less than 0.05. According to the stratified analysis of pregnancy, the total score of social support was significantly correlated with the depressive status only in the third trimester, OR (95%CI) was 0.97(95%CI 0.94-0.99). Objective support dimension was significantly correlated with depression status in the first and third trimesters, the OR (95%CI) was 0.78(95%CI 0.61-0.99) and 0.89(95%CI 0.84-0.94), respectively. The OR of support utilization score in the third trimesters was 0.91(95%CI 0.83-0.99). Conclusion Social support is negatively correlated with depression during pregnancy and is particularly important in the third trimester. Dimensions of social support were differently correlate with depressive status during pregnancy. Objective support dimension is particularly important in first and last trimester, and the utilization of social support is significantly negatively correlated with depressive state during pregnancy in last trimester.