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Aim: The study aimed to identify predictive risk factor to identify high‐stage histological chorioamnionitis (HCA) in pregnancies with cervical incompetence (CIC). Methods: A retrospective cohort study was conducted by including 116 pregnant women with cervical incompetence that required prophylactical and therapeutical cerclage. The histopathology examination on placenta was conducted with informed patient consent. All the cases included in this study were divided based on the severity degree of HCA. The demographic characteristic and the parameters related to maternal and fetal outcome were all analyzed. Besides, perioperative parameters of cerclage, including cervical length, cervical morphology, and laboratory indexes were also compared between two groups. Univariate and multivariate logistic regression analysis were used to determine the risk factor of severe chorioamnionitis. Results: Severe HCA was significantly associated with cervical morphology, cerclage indication, cerclage type, and cervical length measured via ultrasound and vaginal examination. After adjusted for confounders, V‐type funneling and short cervix was indicated as independent risk factors of severe HCA by multivariate logistic regression analysis, respectively. Conclusions: V‐type funneling and short cervix may indicate the elevated risk of high‐stage HCA. Due to the negative outcomes related with high‐stage HCA, appropriate prenatal treatment would improve the pregnancy outcomes in cerclaged population. To facilitate postpartum treatment, placental histological examination should be routinely recommended to identify the high‐stage HCA, especially in high risk pregnancies. [ABSTRACT FROM AUTHOR]