Intussusception is the invagination of one portion of the intestine into the contiguous distal segment. Duringinfancy and childhood it is the most common cause of acquired intestinal obstruction. This is a clinical andradiological study of 120 cases who visited our Chonnam National Universisty Hospital from Jan. 1975 to Aug. 1979.The results were summarized as follows; 1. Age, Sex and Seasonal Incidence. In 120 cases, 88.3% of the patientswere under the one year of age and peak incidence occurred from 4 to 12 month of age. In sex distribution, maleshowed definitely higher incidence than in female patients with the ratio of 2.2:1. Althought the disease occuresthe year around, spring and summer showed somewhat higher incidences. 2. The common symptoms and signs werevomiting (88.3%), bloody stool (81.7%), palpable mass(66.7%), and irritability (29.2%) in order of the frequency.3. The common x-ray findings of plain abdomen were moderate dilatation of gas filled bowels loop (62.8%),obliteration of the gas shadow in the cecum and ascending colon (50%), and soft tissue mass density (43%). 4. Themost common obstructing point found by barium enema was at the hepatic flexure. 5. The over-all reduction rate byhydrostatic barium reduction was 69.4%, and this rate was increased in the following cases; 1) the duration ofsymptoms under the 12 hours (89.2%) and between 13 to 24 hours(70%). 2) no evidence of severe small bowelobstruction. 3) in the caes of ileocecal, ileocolic or colocolic of the type of intussusception. 6. Recurrencerate was 4.2%. 7. Mortaility rate in 120 cases of intussusception was 2.5%.