Pelvic fractures are mostly caused by high-energy violence such as falls from great heights and traffic accidents. Pelvic fractures are life-threatening because they may not only result in serious injuries of the pelvis itself but also are often accompanied by complex severe multiple injuries. This article reports the treatment of an elderly patient with multiple injuries complicated with unstable pelvic fracture and summarizes the concepts and strategies related to the diagnosis and treatment in each specialty. It provides a reference for clinical treatment of such patients.