[Objective] To study the chemical constitutes of C.robustum root,thus to supply evidence for its pharmacological research and therapeutic mechanism.[Method] The chemical constitutes were isolated from C.robustum by silica gel column chromatography,SephadexLH-20 and recrystallization,and their structures were elucidated on the basis of spectral analysis and physicochemical property.[Result] Nine compounds were isolated from the ethyl acetate extract of C.robustum root,and their structures were identified as palmitic acid(I),α-spinasterol(II),α-spinasteryl-3-O-β-D-glucoside(III),β-stigmasterol(IV),16α,23,28-trihydroxy-olean-12-en-3-O-α-L-arabinopyranoside(V),16α-hydroxy-olean-12-en-28 oic acid-3-O-α-L-arabinopyranoside(VI),hederagenin-3-O-α-L-arabinopyranoside(VII),caulophyllogenin-3-O-α-L-arabinopyranoside(VIII),hederagenin-3-O-β-D-glucopyranosyl-(1→2)-α-L-arabinopyranoside(IX).Of them,compound I,II and III were isolated from this plant for the first time.[Conclusion] This method could be used for studying the chemical constitutes of C.robustum root,and the study provides basis for the further development and utilization of this resource. [Objective] To study the chemical constitutes of C.robustum root, thus to supply evidence for its pharmacological research and therapeutic mechanism. [Method] The chemical analysis were isolated from C.robustum by silica gel column chromatography, Sephadex LH-20 and recrystallization, and their structures were elucidated on the basis of spectral analysis and physicochemical property. [Result] Nine compounds were isolated from the ethyl acetate extract of C.robustum root, and their structures were identified as palmitic acid (I), α-spinasterol (II ), α-spinasteryl-3-O-β-D-glucoside (III), β-stigmasterol (IV), 16α, 23,28-trihydroxy-olean- 12-en-3-O-α-L-arabinopyranoside 3-O-α-L-arabinopyranoside (VI), hederagenin-3-O-α-L-arabinopyranoside (VII), caulophyllogenin-3-O -I-L-arabinopyranoside (VIII), hederagenin-3-O-β-D-glucopyranosyl- (1 → 2) -α-L-arabinopyranoside (IX) .Of them, compound I, II and III were isolated from this plant for the first time. [Conclusion] This method could be used for studying the chemical constitutes of C.robustum root, and the study provide basis for the further development and utilization of this resource.