The compositions of hydroperoxy fatty acid components of lipid in raw adlay powder(RAP) and processed adlay powder(PAP) stored at 35$^{circ}C$ and PAP lipid and triglyceride(TG) autoxi야-zed 35$^{circ}C$ were studied. During autoxidation the time taken to reach 100 of peroxide and 13-hydroperoxide isomers were the major hydroperoxy fatty acids found in oxidized adlay lipid. Lower levels of 8-. 10-, 11-, 12- and 16-hydroperoxide isomer were also observed. The composi-tions of hydroperoxy fatty acid componets obtained from sutoxidized RAP lipid and TG were similar to those of hydroperoxy fatty acid components is lipid extracted from stored RAP and PAP.