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A new derivative of triterpene named Erigeronol 1 was isolated from the EtOH extract of the aerial part of Conyza canadensis together with 15 known compounds for the first time from this plant.The structure of Erigeronol 1 was elucidated as 3-O-(hydroxyacetyl)-23,28-dihydroxy-β-amyrin by hydrolysis and spectroscopic analysis.Erigeronol 1 showed potent cytotoxic activity with IC50 value of 7.77±0.47 μg/mL against melanoma B16 determined by the 3-(4,5-dimethylthiazo-2-yl)-2,5-dipbenyltetrazolium bromide(MTT)method.