Abstract: The charge transport performance of the Nafion-based redox polymer films prepared under different conditions was investigated by cyclic voltammetry in the sandwiched cells. The results showed that the apparent charge transfer diffusion coefficient(Dct) of the Nafion[M(bpy)2+3, PEG (polyethylene glycol)] (M=Ru or Fe) films is about 10-6-10-7 cm2·s-1 and the mobility of the electron or hole ( μ) was about 10-4-10-5 cm2·V-1·s-1. In order to decrease the resistance of the interface, a polyaniline (PANI) layer was added to the interface of indium tin oxide coated conducting glass (ITO) electrode and the redox polymer. Consequentially , the Dct could be increased to about 10-5-10-6 cm2·s-1 and μ to about 10-3-10-4 cm2·V-1·s-1, and the operating current of the cells under 600 mV bias could be increased by almost 100 times . In addition, the Dct and μ of this redox polymer film had just reduced slightly after 30 d kept in atmosphere. Therefore, the redox polymer film is sufficiently stable.