Chemical investigation of the roots of Rhodiola sachalinensis A. Bor. (Crassulaceae) has led to the isolation of four flavonoids. Structures of these compounds were identified as $kaempferol-3-O-{eta}-D-glucopyranoside$ (1), $kaempferol-3-O-{eta}-D-sophoroside$ (2), $herbacetin-3-O-{eta}-D-glucopyranoside$ (3) and $herbacetin-7-O-{eta}-D-glucopyranosyl(1{ ightarrow}3)-{alpha}-L-rhamnopyranoside$ (4) by the analysis of spectroscopic evidences and comparision with the data of authentic samples.