Cervical ectopic decidua, a kind of disease which is easily ignored and misdiagnosed by OB-GYN. Its characteristics have not been fully understood and there is no consensus on how to cure it. Objective: The purpose of this study is to analyze the clinical characteristics and treatment experiences of cervical ectopic decidua during pregnancy. Materials and Methods: The detailed clinical manifestation, diagnosis, curative results in 11 cases of such disease were analyzed in Sichuan Provincial Hospital for Women and Children. Results: Cervical ectopic decidua is the primary reason of vaginal bleeding during pregnancy. This disease can be precisely diagnosed after gynecological examination, cervical cytology, colposcopy, and cervical neoplasm biopsy. Conclusion: For pregnant women with vaginal bleeding over a long period due to cervical and decidua polyps, cervical neoplasm elimination could be chosen after the diagnosis is confirmed. This is the first time that color Doppler ultrasound was utilized to diagnose cervical decidua polyp. The value of diagnosing and treating cervical decidua polyps requires more investigations.