The surface morphology,elements distribution at he interface between coating and matrix,accelerated life time test and failure mechanism were discussed under the conditions of different sublayer surface modifications for Ti/(IrO2+Ta2O5)anodes such as special surface treatment(SST),metal Ta and Pt modification.The results show that Ti based surface modification has no basal influence on the surface morphology,the anodes have very long term accelerated life time at the flat stage with different surface modifications.Electrolysis dissolve of oxides is the main failure mechanism for the anode at the flat stage starting from island banks.