The eleven infants with acute intussusception in the range of 2-12 months old were admitted to the Sacred Heart Hospital in the period from October 6, 1976 to October 4, 1977, and the intussusception were reduced nicely by the means controlled air insufflation in all cases. The mean pressure bringing the best visualization of the intussusceptum and the fovorite reduction of intussusception was 59mm Hg. and another mean pressure giving rise to good reduction of all the ilecolic intussuseption was 90mm Hg. of the air. This method was so safe and simple that“controlled air insufflation”is recommendable to be applied safely without contraindication for diagnosis and treatment of intussusception, particalarly in the infants.