Cerium doped tantalum oxide (Ce-Ta2O5) particles were synthesized with hydrothermal method. The electrochemical behaviour of Ce-Ta2O5 film electrode in 0.1 mol dm-3 KCl containing 10 mmol dm-3 K3Fe(CN)6 was investigated with cyclic voltgrammetry (CV). The CV results indicated that the electrochemical reaction on the Ce-Ta2O5 film electrode exhibited stable electrochemical property. In addition, the phase structure of Ce-Ta2O5 prepared was performed by X-ray diffraction (XRD). The result revealed that the cerium doped Ta2O5 belongs to orthorhombic crystal.