Bowel rupture due to blunt abdomimal trauma is no longer rare, and is among the most challenging problems that confront the phasicians and radiologists. It is frequently difficult to diagnose because the symptoms may be trivial during the early stage and masked by more obvious, but less lethal injuries. It is well known that the roentgen examination of the abdomen is also of little value to exclude bowel rupture becasue of infrequency of positive findings and free gas. The plain films of 23 casesof jejunal rupture and 8 cases of ileal rupture wete evaluated to sort and diagnostic features of small bowel rupture caused by blunt abdominal trauma. 1. Free intraperitoneal gas was noted in 6 cases of jejunal rupture and 1 cases of ileal rupture, and definite radiological evidence of free intraperiftoneal fluid was present in 16 casesof patients.