There is the trend of increasing number of outpatients who are requiring surgical intervention because of medical insurance and general improvement of economic state. Ambulatory surgical clinics are prospering in the United States. Thus we have analyzed 1957 cases of outpatient anesthesia excluding local infiltration performed by surgeons from total of 4302 cases o fout patient surgery during the 5 year period between 1975 and 1979. The results of this analysis were as follows: 1) Ketamine IM or IV was used as a sole agent in 500 cases who were under 12 years of age and mean operation and recovery time were 19.95 and 58. 45 minutes, respectively. 2) Mean operation and recovery time for 1,125 cases of pentothal+N₂O+O₂, anesthesia were 15. 55 and 108. 23 minutes, respectively. 3) For 321 cases of halothane+N₂O+O₂, anesthesia, mean operation and recovery time were 40.67 and 145. 94 minutes, respectively. 4) During recovery period there were no serious complications or mortality. 5) The majority of 1,125 among 1,957cases were gynecological outpatients and the rest were distributed among the surgical departments and dermatology, 6) Pentothal, nitrous oxide, halothane and ketamine were used safely for the outpatient anesthesia according to our experiences.