NOVELTY - A sizing agent preparation method involves dissolving titanium salt in distilled water to form solution. Alkali solution is dropped in the solution. The titanium salt is reacted with the alkali solution to produce sediment till. The sediment is centrifugally separated from the solution. The separated sediment is water-washed for three times. Oxide is added in the solute content in the sediment to form titanium hydroxide solution. The titanium hydroxide solution is diluted. The material is added into a reactor to react and obtain a sizing agent.    USE - Method for preparing sizing agent of a scattering layer of a dye sensitive solar battery.    ADVANTAGE - The method enables preparing the sizing agent without using surface active agent, so that an optic-electric converting layer and an electric conducting layer can be effectively prevented from being corroded. The method enables increasing the photo current density of the dye sensitive solar cell and an optic-electric converting efficiency of the battery.    DETAILED DESCRIPTION - A sizing agent preparation method involves dissolving titanium salt in distilled water to form solution, where a weight ratio of the titanium salt to distilled water is 1:5-1:20. Alkali solution is dropped in a mass content of 5-40% of the solution. The titanium salt is reacted with the alkali solution to produce sediment till, where a pH value of the solution is 6-8. The sediment is centrifugally separated from the solution. The separated sediment is water-washed for three times, where each water-washing operation lasts for 5-15 minutes. Oxide is added in the solute content of 5-30% in the sediment till, the sediment is completely dissolved to form titanium hydroxide solution. The titanium hydroxide solution is diluted using distilled water according to a volumetric ratio of 1:1-1:20. The material is added into a reactor to react at 100-220 degrees C for 6-48 hours to obtain a sizing agent. An INDEPENDENT CLAIM is also included for a method for modifying sizing agent of a scattering layer of a dye sensitive solar cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a side view of a dye sensitive solar battery.