Two new sesquiterpenoids,(1S,2R)-dihydroxycycloax-4(15)-ene(1),14-dehydroxyl daucucarotol(2),and one new rhamnofalane diterpenoid,2-hydroxy-3-dehydroxycaniojane(3),together with two known compounds,curcusone D(4) and curcusone C(5),were isolated from the roots of Jatropha curcas.The chemical structures of these compounds were established by chemical methods and extensive 1D-and 2D-NMR spectroscopic data analyses. Two new sesquiterpenoids, (1S, 2R) -dihydroxycycloax-4 (15) -ene (1), 14-dehydroxyl daucucarotol (2), and one new rhamnofalane diterpenoid, 2-hydroxy-3-dehydroxycaniojane known compounds, curcusone D (4) and curcusone C (5), were isolated from the roots of Jatropha curcas. These chemical structures of these compounds were established by chemical methods and extensive 1D-and 2D-NMR spectroscopic data analyzes.