Following on from diagnosis using ultrasound, hydrostatic reduction usign saline enema under ultrasound guidance was tried in 20 cases of childhood intussusception. The conclusion were as follows : 1. Success rates of saline enema uncer ultrasoun guidance during a first-8month period(P1) and a second-10 month period(P2) were 55.6%(5/9) and 54.5%(6/11) respectively. Average success rate was 55%(11/20). 2. During the periods of P1 and P2 , no case was reduced by barium enema in 6 cases of failed reduction with saline enema. 3. Duringthe period of P2, 5 cases of successful reduction with saline enema were confirmed by clinical follow up without barium enema. 4. During the periods of P1 and P2, 9 cases of failed reduction with saline enema were operated, resulting in 6 cases of segmental resection and 3 cases of manual reduction. 5. The obvious advantage of this method are : 1. No radiation hazard. 2. No fear of barium peritonitis. 3. Detection of leading point. 6. With above res lts, this method could compeltely replace barium enema. And ultrasonography should be the initial study inthe evaluation of intussusception in children and then if necessary, aline enema under ultrasound guidance should be done.