Abstract: The Ti/SnO₂-NiO-RuO₂ electrodes with different doping amounts (0, 9.1%, 16.7%, 23.1%, 28.6%, mole fraction) of RuO₂ were prepared by thermal decomposition method. The effect of doping amount of RuO₂ on the electrocatalytic degradation performance of the Ti/SnO₂-NiO-RuO₂ electrodes was studied. The results show that doping RuO₂ increased the concentration of adsorbed oxygen, the number of active sites and the kinds of valence states of ions on the surface of Ti/SnO₂-NiO-RuO₂ electrode. Moreover, the specific surface area and voltammetric charge density of the electrode were improved, the electrocatalytic degradation was promoted, and the strengthening life of the electrode was prolonged. The Ti/SnO₂-NiO-RuO₂ electrode had the fastest electrocatalytic degradation speed for methyl orange when the doping amount of RuO₂ was 23.1%, and the degradation rate was the largest, reaching 87% after degradation for 3 h, which was 30% higher than that of the electrode undoped RuO₂; the electrode had a good electrocatalytic effect.