Objective Radix of Actinidiae chinensis,a medicinal plant used in China,is the dry root of Actini-diaceae plant and has been extensively employed to treat cancers of various organs,including the lung,liver and digestive system.However,up to now,its active antitumor and antiviral fractions remain unclear.The main purpose of this study is to identify the antitumor and antiviral sites of Radix of Actinidiae chinensis,which provides evidences for its further development.Methods Radix of Actinidiae chinensis was extracted by the refluxing sequentially with acetidin,ethanol and water,followed by the column chromatography and thin layer chromatography.The antitumor effects on Bel-7402,SW-620 and MDA-MB-231 tumor cells were investigated to screen the active antitumor sites by cell inhibition,the growth curve and the apoptosis staining.Meanwhile,to screen the active anti-hepatovirus fractions,the cell growth and the secretion of HBsAg and HBeAg in HepG2.2.15 cells were evaluated by the MTT test and enzyme-linked immunosorbent assay respectively.Results The acetidin fraction Y(Y1+Y2),the ethanol fraction A(A1+A3+A4) and B(A1+A4+A6),and the fraction compound C(A1+A4+Y1) have strong inhibitive effects on Bel-7402,SW-620 and MDA-MB-231 tumor cell lines.Moreover,the tumor cell apoptosis could be induced by the ethanol fraction B and the fraction compound C.In HepG2.2.15 cells,the treatment indexes of the acetidin fraction Y,the ethanol fraction A and the fraction compound C all exceeded 2 on the secretion of HBsAg,indicating the suppre-ssive effects of them on hepatitis B virus.The fraction yields of A,B and C exceeded 50%(60.28%,54.35% and 62.64% respectively),while that of Y did not(17.7%).Conclusion The ethanol fraction B and the fraction compound C are the antitumor sites of Actinidiae chinensis Radix,while the ethanol fraction A and the fraction compound C are its antiviral sites. Objective Radix of Actinidiae chinensis, a medicinal plant used in China, is the dry root of Actini-diaceae plant and has been extensively employed to treat cancers of various organs, including the lung, liver and digestive system. Now, up to now, its active antitumor and antiviral fractions remain unclear. The main purpose of this study is to identify the antitumor and antiviral sites of Radix of Actinidiae chinensis, which provides evidences for its further development. Methods Radix of Actinidiae chinensis was extracted by the refluxing sequentially with acetidin, ethanol and water, followed by the column chromatography and thin layer chromatography. The antitumor effects on Bel-7402, SW-620 and MDA-MB-231 tumor cells were investigated to screen the active antitumor sites by cell inhibition, the growth curve and the apoptosis staining. Meanwhile, to screen the active anti-hepatovirus fractions, the cell growth and the secretion of HBsAg and HBeAg in HepG2.2.15 cells were evaluated by the MTT test and the enzyme-linked immunosorbent assay respectively. Results The acetidin fraction Y (Y1 + Y2), the ethanol fraction A (A1 + A3 + A4) and B (A1 + A4 + A6), and the fraction compound C (A1 + A4 + Y1) have strong inhibitive effects on Bel-7402, SW-620 and MDA-MB-231 tumor cell lines. Moreover, the tumor cell apoptosis could be induced by the ethanol fraction B and the fraction compound C. In HepG2.2.15 cells, the treatment indexes of the acetidin fraction Y, the ethanol fraction A and the fraction compound C all exceeded 2 on the secretion of HBsAg, indicating the suppre-ssive effects of them on hepatitis B virus. The fraction yields of A, B and C exceeded While that of Y did not (17.7%). Conclusion The ethanol fraction B and the fraction compound C are the antitumor sites of Actinidia chinensis Radix, while the ethanol fraction A and the fraction compound C are its antiviral sites.