A retrospeetive analysis was performed on 35,598 pediatric patisnts who had received operations from 1986 to 1993 in eight operating rooms, Seoul National University Childrens Hospital (SNUCH). The average distribution of the patient by department in descending order was pediatric sugery 22%,orthopedic sugery 15%,cardiothoracic sugery 14%,otolaryngology 14%, opthalmology 11%,plastic sugery 11 %,urology 8%,neurosugery 4% and others 0.3%. Opthalmology and urology share one operating room each other, why they have some limitations in performing operations. Total number of operations showed generally increasing tendaney ; 3241 in 1986, 4245 in 1987, 4744 in 1988,4402 in 1989, 4522 in 1990, 4786 in 1991, 4921 in 1992 snd 4737 in 1993. The average age distribution in descending order was 38% in group between 2 and 5 years, 28 in group between 6 and 10 years, 16% in group over 10 years, 15% in group between 1 month and 1 year and 3% in group under 1 month. The ratios of emergency sugeries are 8.7%, 5.9%, 6.4%, 12.2%, 5.9%, 6.9%, 9.35% from 1986 to 1993 in sequence. General inhalation anesthesia has been the main anesthetic, of which the ratios are over 95% generally. Utility ratios of pediatrie operating room for each departments increased generally year by year.