Abstract:Six compounds were isolated from the root hark of Aralia decaisneana and elucidated by spectral and chemicalanalyses as 3-O-[β-D-galactopyranosyl- (1→4)-β-D-galactopyranosyl- ( 1→3)-β-D-glucuronopyranosyl)-oleanoyic acid(Ad-V),chikusetsusaponin Na (Ad-Ⅳ) ,deglucose chikusetsusaponin Ⅳa (Ad- X ) ,palmitic acid (Ad- Ⅳ ) ,β-sitos-terol (Ad-Ⅳ) and oleanolic amd (Ad-Ⅷ). Ad-v was obtained from nature far the first time, and the rest were allobtoined from this plant for the first time.