Objective: To explore the radiological anatomy of classification of internal iliac arteries (IIAs) as well as variant origins of obturator artery (OA), prostatic artery (PA) and uterine artery (UA) in adults based on CT angiography (CTA). Methods: A total of 163 patients undergoing pelvic CTA for vessel evaluation before kidney transplantation were retrospectively enrolled. Multiplanar reformation (MPR), maximum-intensity-projection (MIP), and volume-rendered (VR) based on axial images were performed on an off-line workstation. The origins of OA, PA and UA were studied. Results: Type A，B and C accounted for 70.2%, 28.3%, and 1.5% respectively. In addition, the most frequent OA origin was inferior gluteal and internal pudendal trunk (GPT), accounting for 27.6%. The most frequent PA and UA origins were IPA , accounting for 38.5% and 44.8% respectively. Conclusion: Pelvic CTA examination can clearly display the classification of IIA, and variant origins of OA, PA and UA.