Author studied the value of the plain abdominal films in deciding the operability in 188 infant cases ofintussusception by analizing plain films of hte abdomen taken routinely before the barium enema applied, whovisited Busan National Universtiy Hospital during 8 years from January. 1966 to Jan. 1974. The results obtainedwere summarized as follows; 1. The 72.4% of the patients observed was below one year of age and male and femaleratio was 2.6:1. 2. The 143 cases (76%) of 188 cases were applied barium reduction and then 78 cases (54.5%) hadgood results. 3. Among the patients who visited the hospital within 24 hrs. after the onset of symptoms the 70case (61%) of 114 cases had good results. 4. The 38 cases (75%) of 51 cases who showed normal gas pattern orslight distended gaseous bowel loops and mild air fluid levels on the plain films of abdomen, had good results bybarium reduction. 5. The Plain films of abdomen showed the marked distension of gaseous bowel loops and air-fluidlevels in the cases arrived at the hospital after 7 hours following the onset of symtoms. 6. The percentage of thesuccess of barium reduction was rather poor in the cases with the mass shadow on the plain films of abdomen thanin the cases without it.