We have been investigating the marine microbial fuel cell(MFC) composed of biofilm covered stainless steel cathode and TiO2 coated stainless steel anode in seawater. It is necessary to improve the properties of anode electrode for increase the power density of MFC. The purpose of this study is to improve the photo-potential characteristics of TiO2 anode. In the present work, we focused on the film formation method of TiO2 for the improvement of photo-potential properties by introducing screen printing method with the annealing into the coating process of TiO2 film. The electrode was stainless steel Type 329J4L (40mm in square, 1mm thickness) coated by TiO2 film. Titanium dioxide film was composed of two layers formed by repetition of film forming process with two methods of squeegee printing and screen printing. Sintering condition of first layer took 60 minutes at 150°C and took 30 minutes at 550°C for second layer. The composition of TiO2 paste was as follows, TiO2(anatase):16, alcohols:17 and H2O:67 in mass.%. After film formation, electrodes were annealed with changing heat treatment temperatures. Annealing temperatures were 100°C, 150°C and 200°C, cooling method was air cooling. TiO2 electrodes were immersed in the 1 liter artificial seawater as an electrolyte and photo-potential was measured using the potentiostat with saturated calomel electrode(SCE) as a reference electrode. The light source irradiated was 150W Xenon lamp which was calibrated 250nm to 800nm and quantity of light was 10.5mW/cm2on the electrodes surface. We measured photo-potentials three times under the light irradiation for each electrode. Steady photo-potentials of electrode manufactured by the squeegee method were -548mV(vs.SCE) at the experiment of first run, -510mV(vs.SCE) at the second and -515mV(vs.SCE) at the third. The increase of photo-potential occurred was considered by the substrate corrosion resulted from small cracks of TiO2 film during the sintering. On the other hand, steady photo-potentials of the electrode manufactured by the screen printing method were -517mV(vs.SCE) at the experiment of first run, -518mV(vs.SCE) at the second and -517mV(vs.SCE) at the third. It was considered that uniformly formed film by the screen printing improved the durability of film. From the results, the durability of electrodes improved reproducibility of repetition by the introducing the screen printing method. It was considered that corrosion which affects the photo-catalytic reaction of TiO2, was suppressed by forming the uniform film due to the screen printing method. We investigated also the effect of annealing process to the electrode which was coated TiO2 film by the screen printing method. Photo-potentials of electrodes were -557mV(vs.SCE) at annealing temperature of 100°C , -589mV(vs.SCE) at 150°C and -593mV(vs.SCE) at 200°C. It is considered that the increase of the oxygen defect by the annealing process improved the semiconductor intrinsic properties of the TiO2 film.