2-methyl-7-(2-(1H-(2-methyl-benzoimidazole)-1-yl)ethoxy)-4′- methoxy isoflavone was synthesized by using resorcinol and 4-methoxyphenylacetic acid as basic reagents. The structure and component of the target compound were characterized with IR, 1H NMR, 13C NMR spectroscopy and elemental analysis. The antioxidative activity of the resulting compound has been investigated using spectrophotometry with safranine T-Mn2+-H2O2 system. The result indicated that the compound present′s a good capacity in scavenging free radical.