Purpose: The purposes of this study were to evaluate the plain radiologic findings of the childhoodintussusception and to evaluate the role of plain abdominal films in predicting the success of air or bariumreduction. Subjects and Methods: We retrospectively reviewed 140 cases with the diagnosis of intussusception inchildren. The radiological signs that included soft tissue mass,dilatation of small bowel suggestingobstruction,crescent sign,and target sign were evaluated in terms of frequency.The relationship betweenradiological findings and outcome of reduction was analyzed. The site of soft tissue mass or crescent sign seen onplain radiographs was correlated with the position of the apex of the intussusceptum seen at the beginning ofbarium enema.The degree of dilated small bowel was evaluated by calculating the proportion of air-filled smallbowel occupying peritoneal cavity and measuring the maximal diameter of dilated bowel lumen.The radiologicalfinding for small bowel obstruction is determined by observation of the degree of small bowel dilatation and/orair-fulid levels. Results: Ninety-two cases out of 140 showed one or more radiographic signs. Two most commonsigns were soft tissue mass and small bowel obstruction. The success rate of air or barium reduction wassignificantly lower in patients with most severest degree of dilatation of small bowel and/or more than 7air-fulid levels on erect view. The suspected location of intussusception on plain radiographs correlated wellwith the true location of intussusception seen in the first few seconds of barium reduction. Conclusion: Plainabdominal radiography is useful in the diagnosis of intussusception and provides helpful informations for thereduction procedure as well as for the exclusion of the contraindications such as bowel perforation.