NOVELTY - (In parts weight) cerium acetylacetonate hydrate (1.5-2.5), gadolinium acetylacetonate hydrate (0.35-0.45), methyl alcohol (20-30), N,N-dimethylformamide (0.3-0.5), tetrahydrofuran (3.0-4.0), chloroform (5.0-6.0), and polyisoprene-polyoxyethylene block copolymer (0.5) are mixed, poured into glass culture dish, covered, and baked. Cover of culture dish is opened, continuously reacted, transferred into high-temperature furnace, and roasted under argon atmosphere, and air atmosphere, sequentially, to obtain high-crystalline ordered mesoporous gadolinia-doped ceria solid solution.    USE - Preparation of high-crystalline ordered mesoporous gadolinia-doped ceria solid solution.    ADVANTAGE - The ordered mesoporous gadolinia-doped ceria solid solution has high crystallization degree, specific surface area, and uniform pore structure.    DETAILED DESCRIPTION - (In parts weight) cerium acetylacetonate hydrate (1.5-2.5), gadolinium acetylacetonate hydrate (0.35-0.45), methyl alcohol (20-30) and N,N-dimethylformamide (0.3-0.5) are added into flask that is equipped with electromagnetic stirring device, and stirred at room temperature for 1-2 hours, to obtain gadolinia-doped ceria precursor colloidal sol. Tetrahydrofuran (3.0-4.0) is mixed with chloroform (5.0-6.0), polyisoprene-polyoxyethylene block copolymer (0.5) is added, dissolved at 65-70 degrees C for 1 hour, and cooled to room temperature, to obtain polymer solution. Gadolinia-doped ceria precursor colloidal sol is poured into obtained polymer solution, mixed at room temperature for 1 hour, to obtain mixed solution. Obtained mixed solution is poured into glass culture dish, covered, and baked in oven at 65-70 degrees C for 24 hours. Cover of culture dish is opened if mixed solution is thick, and continuously reacted for 40-60 minutes, to obtain hybrid materials of gadolinia-doped ceria-polyisoprene-polyoxyethylene block copolymer. The obtained copolymer is transferred into high-temperature furnace, roasted at 600-700 degrees C under argon atmosphere for 2-3 hours, to obtain powder of carbonaceous gadolinia-doped ceria solid solution, which is roasted at 400-500 degrees C under air atmosphere for 2-3 hours, to obtain high-crystalline ordered mesoporous gadolinia-doped ceria solid solution.