Results: The compound of 3', 4', 5, 7-tetrahydroxyflavon, 3, 3', 4', 5, 7-pentahydroxyflavon; 3-hydroxy-3', 4', 5, 7-tetramethoxyflavon; 3, 3', 4', 7-tetraacetoxy-5-hydroxyflavon; 3', 4'-dihydroxy-5, 7-dimeth-oxyflavon showed stronger antioxidant activities than that of chrysin.