Effects of tocopherols and $eta$-carotene on the oxidation of the solid model system of a free fatty acid mixture (64.5% of linolic acid ; 26.4% of oleic acid ; 5.0% of palmitic acid) with tocopherols and $eta$-carotene were studied. $alpha$-tocopherol revealed an antioxidant activity at the concentration below 0.05%, however, it showed a prooxidant activity when the concentration was higher than 0.05%. The antioxidant activity of ${gamma}$ -tocopherol was not affected by the concentrations in the range of 0.01~0.10% in the model and ${gamma}$-tocopherol showed higher antioxidant activity than that of $alpha$-tocopherol. It seemed that $alpha$-tocopherol was unstable compared to ${gamma}$-tocopherol during oxidation. $eta$-carotene showed a weak antioxidative activity at the initial stage of this system while $eta$-carotene showed a prooxidant activity in the presence of tocopherol. $eta$ -carotene was highly susceptible to autoxidative degradation during oxidation.