Abstract: Cu(Ⅱ),Fe(Ⅲ),Mn(Ⅱ) and Ni(Ⅱ) mononuclear complexes containing bezimidazolyl-rich ligand have been synthesized and characterized by elemental analysis,ultraviolet-visible spectra(UV-Vis.),IR and molar conductivity.The kinetics of pyrogallol oxidation catalyzed by the complexes have been studied.It is apparent that Michaelis-Menten equation curves of different metal center complexes are fine and the activities of all complexes would increase with the increasing of pH values.Mechanism of pyrogallol oxidation has been checked up by electrospray ionization(ESI) mass spectra.Pyrogallol is first oxidized to o-quinone,then to purpurogallin.