The freshwater fish fauna of the Sobaeksan National Park was censused during May 1992 to October 1992 at nine sampling stations to establish base line data for national conservation program on the National Park. Twenty seven freshwater fishes included 13 endemic species in Korea belonging to 9 families were collected in this region. Fifteen species were found in Hangang and 17 species were found in Nackdonggang. however common species were only 6 species. Dominant species. of this region were Zacco temminckii. Moroco oxycephalus. Liobagrus andersoni and Odontobutis platycephala. Morphological anomaly was appeared in 11 species include Zacco temminckii. Zacco platypus. Moroco oxycephalus. thus definitive analysis and consideration for natural conservation need to this situation.