Ti/RuO2-TiO2-SnO2 electrode with IrO2-MnO2 interlayer was prepared via thermal decomposition. SEM, EDX, XRD and CV were employed to characterize the interlayer, and electrochemical stability was characterized by acceleration life time test. Results show that precursors are completed decomposed at 450 oC. The interlay shows fine grains, compact surface structure and low electrochemical porosity. Acceleration life time is greatly increased form 7.5 h to 995.8 h by adding interlay, much higher than the national standard of 20 h.