Abstract: Antioxidative effects of extracts of Officinal Magnolia on lard were measured by Na2S2O3-12 titrimetric method.The results show that the antioxidative activities decreased in the order of ethyI acetates extracts > 60% ethanol solution extracts >95% ethanol solution extracts > n-hexane extracts > pure water extracts.The usage of extracts is in directly prportion to the antioxidative effect. Citric acid.tartaric acid,ascorbic acid and α -tocopherol show synergistic antioxidative activities with extracts of Officinal Magnolia.When two of these (Citric acid,tartaric acid.ascorbic acid and α -tocopherol )were used together with Officinal Magnolia extracts of Officinal Magnolia. strong synergistic action was showed.

Key words: Officinal Magnolia extract Synergistic antioxidative activity