A method was established to determine germacrone, furanodiene, curdione and curzerene in curcuma oil.TLC was applied, silica gel thin layer plates were used, hexane-Bu acetate (98:2) was as developing agent, and vanillin sulfuric acid was used in displaying color.Rf of germacrone, furanodiene, curdione and curzerene was 0.11, 0.31, 0.50 and 0.60.The method was simple, accurate, with good reproducibility.