There are few reports analyzing the results of intensive care for children in Korea. A total of 40 critically ill pediatric patients were evaluated in terms of Therapeutic Intervention Scoring System (TISS), The group was composed of patients from 4 services: cardiothoracic surgery, pediatric surgery, pediatrics and other surgeries. We evaluated duration of stay and cost in pediatric intensive care unit (PICU), Seoul National University Hospital, and TISS related to departments. The patients with higher TISS showed longer duration of stay and higher cost in PICU than those with lower TISS. The duration of stay of the patients with high TISS more than 50 was 5.0 days, but it was 2.8 days in 40-49, 2.4 days in 30-39, 2.1 days in 20-29 and 1.9 days in 10-19 of TISS's, respectively. The postoperative first day cost of intensive care was approximately 2,210,000 Won in the patients with high TISS more than 50, but it was 1,060,000 Won in 40-49, 220,000 Won in 30-39, 460,000 Won in 20-29, 120,000 Won in 10-19 of TISS's, respectively. The patients in cardiothoracic surgery showed higher values in maximum, minimum and discharge TISS than other services. Maximum, minimum and discharge TISS of the patients in cardiothoracic surgery were 41, 28 and 23, respectively. TISS's of patients in pediatric surgery and neurosurgery were similar, but durations of stay in PICU were 3.5 days in pediatric surgery and 1.2 days in neurosurgery. In this study, we conclude that duration of stay in PICU and cost of intensive care might be proportional to TISS.