A new podocarpane diterpene, 7&agr;,15-dihydroxypodocarp-8(14)-en-13-one (1) and eight new abietane diterpenes, abiet-8(14)-en-7&agr;,13&bgr;,15,18-tetraol (2), 7&agr;,13&bgr;,15-trihydroxyabiet-8(14)-en-18-oic acid (3), 13&bgr;,18-dihydroxyabiet-8(14)-en-7-one (4), 13&bgr;,15,18-trihydroxyabiet-8(14)-en-7-one (5), 7-oxo-13&bgr;-methoxyabiet-8(14)- en-18-oic acid (7), abiet-8(14)-en-7&agr;,12&agr;,13&bgr;,18-tetraol (8), 7&agr;,12&agr;,13&bgr;-trihydroxyabiet-8(14)-en-18-oic acid (9), and abiet-8(14)-en-7&agr;,12&agr;,13&bgr;,15,18-pentaol (10) were isolated from the CHCl3extract of the cones ofLarix kaempferi. Their structures were determined on the basis of chemical and spectral evidence. The inhibitory effects of compounds1-4and7-9on Epstein-Barr virus early antigen (EBV-EA) activation induced by the tumor promoter, 12-O-tetradecanoylphorbol-13-acetate (TPA), were examined for a primary screening for anti-tumor promotors.Key words:Larix kaempferi, Pinaceae, cones, abietane, EBV-EA.