This study had been done to predict the change of the fish fauna and distribution after completion of Dae-Chung Dam, around the Dam under construction from 10th of Mar. till 31st of Oct. 1976. Therefore we sampled 15places along Geum River and classified, Put in order, and made a list of fish fauna collected from each sampled place. So we probed the distribution of fish fauna. The already published papers and this study showed as 24 families, 64 genuses, 89 species lived along the Geum River. This study contained 3 families 12 genuses, 15 species. The percentage of fish fauna in Geum River is 40.5% of it in Korea. The completion of Dae-chung Dam may be make Hemibarbus labeo, Siniperca scherzeri, Opsariichthys bidens and so on multiply as Uiam lake and Chun-cheon lake do. But Gonoproktopterus mylodon can be moved up for a habitat because spawning place must be lost. Among the fish fauna in Geum river, Korean special species are Pseudoperilampus uyekii, Pseudoperilampus suigensis, Gonoproktopterus mylodon, Gnathopogon coreanus, Gnathopogon majimae, Pseudopuntungia, Moroco sp., Acheilognathus yamatsutae, Coreoleuciscus splendidius, Sarcocheilchtys waiyae, Gobiobotia brevibarba, Microphysogobio yaluensis, Microphysogibio koreensis, Pseudobagrus sp., Liobagrus andersoni and so on, Pseudoperilampus suigensis is probed to be in the middle of the Geum river by this study.