In order to fabricate dense yttria-stabilized zirconia (YSZ) electrolyte films supported by NiO-YSZ anode substrates, electrophoretic deposition (EPD) was used. For the EPD, graphite films with thickness below 1μm were pre-coated on the surface of a non-conducting porous NiO-YSZ composite substrate. YSZ green films were formed in quality on the reverse sides, which did not have the graphite layers. The green films were transformed into dense bodies with thickness of 5-10μm after being co-fired with the substrates. A single cell was constructed on the ca. 5μm thick dense YSZ films supported on the anode substrates. In the single cell, La(Sr)Co(Fe)O₃ was used as the cathode. It was observed that maximum output densities of ～0.19, ～0.61 and ～1.02 W/cm² were attained at 600, 700 and 800 ℃ , respectively.