〔Abstract〕 A retrospective analysis of 258 polycystic ovary syndrome(PCOS) patients and 604 control persons was conducted to analyze the predictive value of uterus thickness on term delivery of PCOS patients and its related factors. Compared with the control group, the uterus thickness of PCOS group was significantly smaller than that of the control group, and the term delivery rate was significantly lower(P<0.05). The area under the ROC curve(AUC) of uterine thickness predicted for the term delivery of PCOS patients was 0.719(95%CI: 0.657-0.781,P<0.001). The cut-off value of uterus thickness was 34.5 mm. There was a significant positive correlation between age and uterus thickness(P<0.001), while there was a significant negative correlation between basal testosterone and uterus thickness(P=0.033) in PCOS patients. The thickness of uterus in PCOS patients is significantly thinner than that in the control group. Uterus thickness is an important factor affecting the term delivery rate of PCOS patients. It has a certain predictive value for the term delivery rate of PCOS patients.