Background: Not much of the fund is invested in the intensive care unit (ICU) in Korea hospitals since the cost of ICU care is set too low compared to he other medical fields as well as to the other part o the world. This study is designed to support the base of an ICU standard guideline in Korea. Methods: The questionnaire were sent to 73 ICUs and 24 neonatal ICUs (NICU) of 30 hospitals. Twenty-two of them were teaching hospitals and 8 of them were general hospitals. Results: The ratios of ICU bed number to total bed number were 5.0% and 6.0% in teaching hospital and general hospital respectively. The ratios of NICU bed to total bed were 3.4% and 20.% in teaching hospital and general hospital respectively. Intensivists were kept in 24.6% of ICU and 36.4% of NICU. Residents were kept in 43.1% of ICU and 45.5% of NICU. The utilization of ICU service was 90% for teaching hospital and 86% for general hospital. The utilization of NICU was 89% for teaching hospital and 3% of general hospital. Nurse to patient ratios varied widely. Most ICUs in teaching hospital showed the nurse to patients ratio of 1:4 which was about 32% of total ICU. Most NICUs in teaching hospital showed the nurse to patients ratio of 1:5 which was around 20% of total NICU. Most of the ICUs were equipped with central piping system for oxygen and compressed air supply, vacuum system and all the necessary medical gadgets such as mechanical ventilators, ECG monitors, defibrillators, pulse oximeters and infusion pumps. Conclusions: The distribution of medical personnel as well as medical equipments were varied widely.