Objective:To determine the content of benzyl glueosinolate(BG) in the pulp and the seed and investigate the anti-cuncer activity of its hydrolysis product in Curica papaya L.Methods: Determination of BG was performed on an Hypersil BDS C_(18) column at the wavelength of 214 nm with 0.1%trifluoroacelic acid(TFA) aqueous solution(A) and 0.1%TFA acelonilrile(B) as the mobile phase.In vitro activity test was adopted with cidtured human lung cancer H69 cell in vitro to investigate the inhibition rate of cell proliferation of benzyl isothiocyanale(BITC) againsl H69 cell.Results:The pulp has more BG before the maturation of papaya and it nearly disappeared after papaya matured,while the seed contains BG at every stage.Activity test demonstrated that the a higher concentration of BITC would have betler inhibition rate of cell proliferation on 1169 cell,and the IC_(50) was 6.5μmol/L.Conclusions:BG also can be produced in the pulp of papaya and it will be stored in the seed after the fruit has been matured.The hydrolysis product of BG has certain cancer-prevention anti-cancer activities for human. Objective: To determine the content of benzyl glueosinolate (BG) in the pulp and the seed and investigate the anti-cuncer activity of its hydrolysis product in Curica papaya L. Methods: Determination of BG was performed on an Hypersil BDS C_ (18) column at a wavelength of 214 nm with 0.1% trifluoroacelic acid (TFA) aqueous solution (A) and 0.1% TFA acelonilrile (B) as the mobile phase.In vitro activity test was adopted with cidtured human lung cancer H69 cell in vitro to investigate the inhibition rate of cell proliferation of benzyl isothiocyanale (BITC) againsl H69 cell. Results: The pulp has more BG before the maturation of papaya and it nearly disappeared after papaya matured, while the seed contains BG at every stage. Activity test demonstrated that the a higher concentration of BITC would have betler inhibition rate of cell proliferation on 1169 cell, and the IC 50 (50) was 6.5 μmol / L. Conclusions: BG also can be produced in the pulp of papaya and it will be stored in the seed after the fruit has been matured.The hydrolysis product of BG has certain cancer-prevention anti-cancer activities for human.