Oxygen was absorbed during the process of decomposition of LAHPO to their SP. The oxygen absorption by LAHPO as well as oxidizing LA was retarded by the addition of antioxidants. The kinetics studies of oxygen absorption reaction were carried out using a polarographic ele-ctrode when LAHPO was in excess or by a respirometer when oxygen was in excess. In both cases, the reaction followed the first-order kinetics. Total amount of the absorbed oxygen by LAHPO was 1.26 moles per mole of LAHPO, that is, the stoichiometric ratio of the reaction of LAHPO with oxygen was 1 to 1. When LAHPO was incubated under oxygen-free atmosphere in the presence of a catalyzer, the decomposition of LAHPO was remarkably reduced. Thus, the oxygen absorption at the degradation steps of LAHPO was due to LAHPO itself and not to SP, and LAHPO was decomposed by the oxygen action. A possible scheme containing linoleic acid dihydroperoxide which was a reaction inter-mediate at the degradation process of LAHPO was discussed.