We studied the effects of the acute intermittent peritoneal dialysis in severe acute renal failure of 1 newborn infant and 2 young infants during 18 months period from February 1985 to April 1986. The predisposing illnesses were severe acute gastroenteritis with dehydration. Reye's syndrome, and bilateral nephrolithiasis with hyperuricemia. The concomitant illnesses were severe hypernatremia, hyponatremia, hyperkalemia, hypocalcemia, hypoglycemia, DIC (disseminated intravascular coagulopathy). Paralytic ileus, metabolic acidosis and gastrointestinal bleeding. As a dialysate, Imperinol solutionR, 1.5% was used in all cases. The cycles of dialysis were 8, 16, and 41 times in each cases. Observed complications during dialysis were leakage, and abdominal wall and scrotal swelling in 2 cases, hyperglycemia in 1 case, and peritonitis in 1 case. Acinetobacter calcoaceticus was cultured in peritoneal fluid of peritonitis. These complications were treated by stopping dialysis in leakage and abdominal wall swelling, insulin therapy in hyperglycemia, and intraperitoneal and systemic antibiotics therapy in peritonitis. We experienced improvements of severe acute renal failure with variable concomitant illnesses by acute intermittent peritoneal dialysis despite of the treatable complications of dialysis in all cases.