RuO2-Co3O4-CeO2(Ru-Co-Ce) composite oxide electrodes were prepared by sol-gel process. The parameters of electrode preparation, including the heat treatment temperature and CeO2 doping content, were optimized. The morphology and composition of the anode surface were characterized by SEM and XRD, respectively. Electrocatalytic activity of these electrodes in 1.0 mol·L-1 KOH solution were studied by means of open-circuit potential (Eoc), cyclic voltammetry (CV), voltammetric charge (q*) and polarization curve. The results show that the preparation temperature influenced electrode surface morphology greatly, and the optimal temperature was 400 oC. The CeO2 of appropriate content could increase the active surface area, reduce the grain size and enhance the electrical conductivity of the electrodes, which was in favor of catalytic reactions and redox transition from RuⅢ to RuⅣ. The anodic overpotential for oxygen evolution was decreased by 60 mV and thus the activity of oxygen evolution was improved. The maximum activity was observed with the Ce content of 0.4 mol%