In this work, formulation of photosensitive pastes was investigated to fabricate barrier ribs of PDP by a photolithographic process. Optimum paste compositions could be achieved by the formulation of alkali-developable polymeric binders, functional monomers, a photoinitiator, and a solvent with barrier rib powders of which surface was treated with fumed silica particles. It was applied to the paste and was found that photolithographic patterns of barrier ribs could be obtained with good resolution up to 110 similar to 120 mu m of height and 60 similar to 80 mu m of width after sintering. This could be explained by increased light transmittance efficiency through UV light guide channel formed with an aid of nano-sized fumed silica used for surface treatment of barrier rib powders.