Ureteral injury is common in gynecologicy oncology operations. important to understand its characteristics. From January 2000 to December 2017, a total of 2041 patients were diagnosed with malignant gynecology diseases and underwent surgery in the Department of Obstetrics and Gynecology, Beijing Chao-Yang Hospital, Capital Medical University. All the medical records were retrospectively reviewed and 27 cases of ureteral injury were identified. The type of gynecologic oncology surgery, the site and the type of ureteral repair and the related morbidity were analyzed. Total number of ureteral injury was 27 (1.32%) out of 2041 patients underwent gynecologic oncology operations. Of the 2041 patients, 1029 had cervical cancer, 401 harbored ovarian cancer and 611 were diagnosed with endometrial cancer. Of all the procedures analyzed, we found 19 cases of radical cervical cancer surgery (1.84%), 5 cases of ovarian cancer surgery (1.25%) and 3 cases of endometrial cancer surgery (0.49%). Ureteral injuries were recognized intraoperatively in 9 patients (33.3%) and postoperatively in 18 patients (66.7%) with a mean delay of 7.8 days (range from 3 to 21 days). The type of ureteral injuries included laceration 3/27 (11.1%), partial or total accidental transection 2/27 (7.4%), partial resection due to tumor infiltration 7/27 (25.9%) and fistula formation 15/27 (55.6%). Ureteral repair surgeries contained 7/27 (25.9%) ureterostomy, 15/27 (55.6%) insertion of Double-J stent and 5/27 (18.5%) ureteral reconnection. Febrile (11/27, 40.7%) and leukocytosis (11/27, 40.7%) were the most common postoperative symptoms. Ureteral injury is a common complication in gynecologic oncology operations. Immediate recognition and treatment based on appropriate guide lines result in good outcome.