A total of 3 epiphytic macroalgae were collected from eelgrass bed in Jindong Bay, and Scytosiphon lomentaria and Colpomenia sp. in Phaeophyta, Gracilaria sp. in Rhodophyta were occurred during study periods. For epiphytic microalgae (diatoms), Cocconeis scutellum and Cocconeis placentula were common species. Seasonal variations of epiphytic algal biomass were marked: the higher epiphytic macroalgae was 3.3 g DW/m2 in November 2003, whereas epiphytic diatoms were 43,153 cells/m2 in June 2003. Compared with those of in other areas (e.g. Kwangyang Bay, Dongdae Bay, and Aenggang Bay), diversity and number of epiphytic macroalgae species was the lowest in the study area. These results were therefore likely due to the severe physical characteristics of the intertidal mudflat and eelgrass biological characteristics.