In order to evaluate the role of a expression of HBV-associated, we investigated histological and cytological distribution of HBeAga, HBeAgb, and HBcAg by immunoperoxidase procedure using monochronal antibodies. Materials submitted for this study were needle biopsied specimens obtained from 41 chronic carriers and serial paraffin sections were used for the immunohistological study. The localization of HBeAga/b antigens was limited in hepatocellular nuclei, and hepatocellular cytoplasm was HBeAg negative, HBeAg was detected in 11 cases (33%) of 33 cases with chronic active hepatitis (CAH) and in 5 cases (63%) of 8 cases with chronic inactive hepatitis (CIH). Among the HBeAg positive 16 cases, HBeAgb was demonstrated in 15 cases, however, HBeAga was revealed only each one case of CAH and CIH, respectively. Most of HBeAg positive cells were distributed in the peripheral zone of the hepatic lobules while the positive cells were found in central to midzonal zones of 3 cases CAH and one case of CIH. All in histopathologically HBeAga/b positive cases were also HBeAg positive serologically. On the other hand, in HBeAg sero-positive patients, histological positive rate of HBeAga/b was in 33% in CAH and 50% in CIH.