As a series of the studies on the specific and indigenous plants of Mt. Halla, the constituents from stem of Rhamnus taquetii (Rhamnaceae) were investigated. From the water fraction of the MeOH extract, a new flavonol glycoside, kaempferide-3-O-${alpha}$-L-rhamnopyranosyl(1->3)-${alpha}$-L-rhamnopyranosyl(1-6)-${eta}$-D-galactopyranoside, was isolated with three known compounds, quercetin, quercetin-3-methylether, kaempferol, by column chromatographic separation using Amberlite XAD-2, ODS-gel and Sephadex LH-20 and elucidated physico-chemical evidences($^1H-NMR,;^{13}C-NMR$,IR, EI-Mass, FAB-Mass, and G.C.),respectively.