Cesarean scar pregnancy (CSP) occurs when a gestation sac is implanted in the previous lower segment cesarean scar. The incidence of CSP is increasing worldwide. Uterine ateriovenous malformation (UAVM) is a rare gynecologic disease. Both of these diseases can cause severe vaginal bleeding and produce high morbidity rate. We describe a case of UAVM induced by a CSP. The patient suffered intermittent vaginal bleeding after two dilatation and curettage (D&C) one month before admission. The suspected diagnosis of CSP and UAVM were made after using transvaginal ultrasound with color Doppler and human chorionic gonadotropin (hCG) examination. Resection of the involved area including the cesarean scar and UAVM by laparotomy was performed successfully and the diagnosis was confirmed by the last pathologic result. The incidence of CSP is increasing worldwide. Uterine ateriovenous malformation (UAVM) is a rare gynecologic disease. Both of these diseases can be severe vaginal bleeding We produce a case of UAVM induced by a CSP. The patient-suffering intermittent vaginal bleeding after two dilatation and curetage (D & C) one month before admission. The suspected diagnosis of CSP and UAVM were made after using transvaginal ultrasound with color Doppler and human chorionic gonadotropin (hCG) examination. Resection of the involved area including the cesarean scar and UAVM by laparotomy was performed successfully and the diagnosis was confirmed by the last pathologic result.