Nano-sized titania powders have been prepared by hydrolysis of tetrabutyl titanate in the droplet of water/OP-7/pentanol/cyclohexane microemulsion system.The effects of ingredient change on the water drop size and particle size were investigated.The prepared TiO2was in the form of anatase after annealing.TiO2was characterized by TG-TGA, FTIR,XRD to measure the transformation temperature,surface adsorption and average size.