Pseudoaneurysm is defined as the aneurysmal cyst resulted from partial or total rupture of vessel membrane, and it can be caused by fracture, operation, laceration, blunt trauma, osteochondroma and so on. When the displaced pelvic bone fracture is diagnosed, the traumatic pseudoaneurysm, which is frequently related by the direct injury of vessel, is one of the common complications, and it can result the massive hemorrhage even death. In case of the displaced pelvic bone fracture, surgeon should check the hemoglobin level and vital sign carefully for the possibility of vascular injury. Authors report the rare case of superior gluteal artery pseudoaneurysm without pelvic bone fractrure.