NOVELTY - Producing titanium oxide doped mesoporous microsphere particles, comprises e.g. mixing titanium precursor and carbon-containing surface directing agent in a first solvent, treating formed titanium-carbon composite particles, removing carbon from titanium-carbon composite particles, filling doping material precursor containing solution in pores of titanium precursor mesoporous microsphere particles, heat treating titanium precursor mesoporous microsphere particles, and converting titanium precursor mesoporous microsphere particles into titanium oxide mesoporous microsphere particles.    USE - The method is useful for producing titanium oxide doped mesoporous microsphere particles (claimed) useful in dye-sensitized solar cell and photoelectrochemical fuel cell, and for disintegrating organic matter using optical catalyst.    ADVANTAGE - The method produces mesoporous titanium oxide doped mesoporous microsphere particles having high specific surface area, improved electrical conductivity, improved light scattering performance, and improved photocatalytic property.    DETAILED DESCRIPTION - Producing titanium oxide doped mesoporous microsphere particles, comprises (a) mixing titanium precursor and carbon-containing surface directing agent in a first solvent to form titanium-carbon composite particles, (b) treating formed titanium-carbon composite particles by heat of solution, and removing carbon from titanium-carbon composite particles to form titanium precursor mesoporous microsphere particles, (c) immersing formed titanium precursor mesoporous microsphere particles in doping material precursor containing solution, and filling the doping material precursor containing solution in pores of titanium precursor mesoporous microsphere particles to form impregnated titanium precursor mesoporous microsphere particles, and (d) heat treating impregnated titanium precursor mesoporous microsphere particles, and converting titanium precursor mesoporous microsphere particles into titanium oxide mesoporous microsphere particles and the doping precursor in pores of the titanium precursor mesoporous microsphere particles into doping material to form titanium oxide doped mesoporous microsphere particles.