NOVELTY - A mesoporous titania collosol is prepared by using triblock copolymer, n-butyltitanate, absolute ethyl alcohol, water, methylethyldiketone, and hydrochloric acid. A mesoporous titania thin film is prepared by aging the collosol and coating onto an indium-tin oxide conductive glass. The thin film is put into an oven for annealing. Ethylcellulose and oleic alcohol surfactant are added and stirred, to obtain a slurry. The slurry is printed on the thin film to form a layer of nanocrystalline mesoporous titania thick film. The thick film is then aged.    USE - Preparation of nanocrystalline mesoporous titania thick film material for electrodes of dye-sensitized solar cells.    ADVANTAGE - The method provides nanocrystalline mesoporous titania thick film materials which form electrodes in which optical excitation voltage reduction is suppressed. The electrodes provide dye-sensitized solar cells having excellent photoelectric conversion efficiency.    DETAILED DESCRIPTION - A mesoporous titania collosol is prepared by using a triblock copolymer, n-butyltitanate, absolute ethyl alcohol, water, methylethyldiketone, and hydrochloric acid in a molar ratio of 0.02-0.04:1:28.5:30:0.5:0.005. The triblock copolymer is used as the template-directing agent, n-butyltitanate is an inorganic precursor, and methylethyldiketone is used for controlling the hydrolysis speed of n-butyltitanate. A mesoporous titania thin film is prepared by aging the collosol at room temperature for 22-24 hours, and rotatably coating the collosol into a film by using a glue distributing table onto an indium-tin oxide conductive glass. The rotating speed is controlled to 2500-3000 rpm and the rotating time is set to 18-20 seconds. The thin film is put into an oven for annealing at 18-24 hours at 90-100 degrees C. 5-8 Wt.% of ethylcellulose is added to the collosol to increase the viscosity of collosol, and then oleic alcohol surfactant is added to increase the surface absorption performance of titania thick film. The mixture is stirred for 18-24 hours by using a magnetic force to obtain a slurry for screen painting. The slurry is printed on the thin film which is rotatably coated to form a layer of nanocrystalline mesoporous titania thick film through a nylon screen of 200 meshes. The thick film is put into an oven at 38-40 degrees C and aged for 45-48 hours. The temperature is raised to the crystallization temperature of 320-380 degrees C at 1 degrees C/minute, and maintained for 3.5-4 hours.