It is well known that halogenated anesthetics have been mainly used for inhalation anesthesia these days. However many controversies still exist concerning hepatic cellular damage after halothane anesthesia. Although several articles have been issued concerning the effects of halogenated anesthetics for hepatitis B surface antigen positive patients, a study of frequent research and strict case collections is meaningful. The authors observed the effects of enflurane anesthesia on 15 HBsAg positive patients who had not recognized themselves whether they had hepatitis symptoms or were carriers. During the period of study, all groups(enflurane study group and enflurane and halothane control groups) did not experience any difficulty with the anesthesia, blood transfusion, and jaundice, etc. The comparative data of liver function tests did not show great differences during the convalescent period. According to this and other recent studies, we can positively conclude that halogenated anesthetics, especially enflurane, may favorably be used to administer HBsAg positive patients, unless any undesirable problems related to anesthesia exist.