Abstract: In order to study the mechanism and performance of electrochemical degradation of sewage Ti/Ti_nO_2n-1 electrode,the morphology and component were characterized by SEM and EDS,the electrochemical performance was tested by linear polarization curve and cyclic voltammetry,fluorescence spectroscopy was used to detect hydroxyl radicals and the performance of sewage degradation was tested through electrochemical degradating simulation sewage.The result shows that oxidation reaction can not occur directly on Ti/Ti_nO_2n-1(4 ≤ n ≤ 10) electrode,however,its overpotential of oxygen evolution can be up to 2.18V(vs.SCE).It was detected that it can produce large amount of hydroxyl radical,indicating that it is a non-active electrode,similar to Ti/SnO₂ electrode.Also it shows that the current efficiency can be up to 40.95% and 22.52% in Na Cl and Na₂SO₄ electrolyte solutions respectively.The degradation efficiency of Ti/Ti_nO_2n-1is superior to that of Ti/SnO₂ and Ti/RuIr electrodes.