NOVELTY - A dye-sensitized titanium dioxide (TiO2) nanocrystal film electrode is prepared by hydrolyzing titanium salt solution and metal doping agent solution, rotating and evaporating obtained emulsion, adding granular TiO2 into colloid, uniformly coating colloid onto clearly washed conductive substrate, immersing and washing film electrode into titanium salt solution, thermally processing, cooling to obtain TiO2 nanocrystal film electrode, heating, immersing electrode into ethanol solution of (2,2'-dipyridyl-4,4'-dicarboxylic acid) ruthenium (II) complex, washing with alcohol, and air-drying.    USE - Preparation of dye-sensitized TiO2 nanocrystal film electrode (claimed) for dye-sensitized solar battery.    ADVANTAGE - The film electrode has improved electrical conductivity, photovoltage and light absorbing efficiency. The method is simple, easy and suitable for industrial production.    DETAILED DESCRIPTION - Preparation of dye-sensitized TiO2 nanocrystal film electrode comprises:    (A) mixing titanium salt and solvent to prepare titanium salt solution, mixing metal doping agent and solvent to prepare metal doping agent solution, and mixing titanium salt solution and metal doping agent solution;    (B) hydrolyzing reacted mixed solution into high pressure reaction kettle at 150-240 degrees C for 4-24 hours, rotating and evaporating obtained emulsion to obtain metal doping TiO2 nanocrystal granules in metal doping TiO2 colloid at 12 wt.%;    (C) adding granular TiO2 with light scattering effect and pore diameter of 25 nm into 1-50% colloid, and uniformly coating colloid onto clearly washed conductive substrate to prepare TiO2 film electrode;    (D) immersing and washing film electrode into titanium salt solution, thermally processing for 30 minutes at 450 degrees C, and cooling at room temperature to obtain TiO2 nanocrystal film electrode; and    (E) heating in a roasting tank at 80 degrees C, immersing electrode into ethanol solution of (2,2'-dipyridyl-4,4'-dicarboxylic acid) ruthenium (II) complex, washing with absolute ethyl alcohol, and air-drying to prepare the product.    A metal of metal doping agent is present in mixed solution at 0.1-5% of titanium salt. The metal doping agent is carboxylate of vanadium, niobium, tantalum, lanthanum, tin, zinc, ruthenium and/or rhodium, or chloride.