A novel titanium-supported nanoporous network platinum electrode（nanoPt）with a enormous surface area was successfully fabricated with successive hydrothermal electrolytic processesIt was shown from cyclic voltammograms in alkaline solutions that current densities during the oxidation of formic acid on the nanoPt were much higher than those on a polycrystalline platinum（Pt），and that the oxidation peak current density on the nanoPt was almost 100 times higher than on PtIt was observed from chrono potentiometric measurements that steady-state current densities on the nanoPt were also much higher than on PtOscillatory behavior was observed both on Pt and on the nanoPt electrodes，but the linear galvanic voltammograms showed that oscillation arose in a much wider range of current densities on the nanoPt than on PtThis novel nanoporous platinum electrode could be used repeatedly and its electrocatalytic activity was stable significantlyIt would be a promising anodic material used in fuel cells.