Four 3,4-seco-lupane trierpenoids were isolated from the MeOH extract of the leaves of Acanthopanax divaricatus forma flavi-flos Yook by using various column chromatography. The chemical structures of isolates were identified as chiisanogenin, chiisanoside, isochiisanoside and 11-deoxyisochiisanoside on the basis of physico-chemical and spectroscopic date($^1H-NMR,;^{13}C-NMR$M$, 2D-NMR and FAB-MS). These compounds were isolated for the first time from A. divaricatus forma flavi-flos.