Acetabular fracture can result insevere limitation of the motion of the hip joint, which supports total weight of human body. Because of different methods of surgical approach according to fracture type, precise interpretation of X-ray films of acetabular fracture is required. We reviewed 38 cases of simple X-ray films showing acetabular fracture. The results were as follows : 1. Almost 60% of the cases-were in their 2nd and 3rd decades. 2. Twenty cases were male, and 18 cases were female. 3. The most common cause of the injury was traffic accident (22 cases, 86.8%), followed by fall down (4 cases, 10.5). 6. Among associated fractures, T-shaped fractures wiere 8 cases(21.1%), followed by both column fractures (6 cases , 15.8%) contralateral iliac bone (1case, 2.6%) and ipsilateral iliac bone(1 case, 2.6%). 8.Injuries of other orabns adjacent to the acetabulum were as follows : ruture of the bladder(3case, 7.9%), urethra(2 cases, 5.3%) and uterus (1 cases, 2.6%).