This work has been done to check the list of the fishes of Lake Seoho and Stream Seodun in Suwon City of Korea. The study has been carried out the collection and the related references since 1954 to 1971. According to the results of the study, the fishes in Lake Seoho are 12 families, 30 genera and 36 species, those of Stream Seodun are 9 families, 18 genera and 20 species. However, they are estimated as 8 families, 26 species in Lake Seoho, and 8 families and 15 species in Stream Seodun in 1971.