Comparative study of the catalytic electrooxidative abilities of RuO x –PdO/Ti and RuO x –PdO–TiO 2 /Ti were conducted using Active Orange 5R solution as simulated wastewater. RuO x –PdO–TiO 2 /Ti anode possesses higher catalytic oxidation ability, as compared to RuO x –PdO/Ti, in both direct oxidation and indirect oxidation processes. RuO x –PdO–TiO 2 /Ti could provide a discoloration rate of 98.14% within 30min, while the COD removal could reach 51.43% in 120min. It was indicated that higher electrooxidation ability could be achieved at RuO x –PdO–TiO 2 /Ti anode, which exhibited lower chlorine evolution potential and higher oxygen evolution potential probably resulted from the higher oxidation states of Ru and Pd.