Abstract
This research was conducted three times at 17 sites from May to October 2021 to determine the degree of restoration of the fish community. A total 4,624 of individuals were collected into 19 species belonging to 9 families. As a result of clustering of each site, the fish species of the Amur river stream system(Youngdong region) and the Yellow river stream system(Youngseo region) were grouped into a mixed group, indicating that the fish community was very disturbed. Especially, Brachymystax lenok tsinlingensis was regionally extinct in the past. But it regained its reputation in the past by habitat expanded from 14%(2004) to 86%(2021). Brachymystax lenok tsinlingensis is keystone species in the upper stream. Therefore it is expected to play an important role in the restoration of the upper stream fish community. 
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