A meso porous transition metal oxide comprising one or more transition metal oxides, wherein the metal is selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ru, Cd, In, Sn, Sb, Hf, Ta, W and Re, and the pore wall of the meso pore thereof has a crystalline structure; and a method for preparing the meso porous transition metal oxide, characterized as comprising a step of carrying out a secondary calcination at 600-800.degree. C. for 10 minutes to 10 hours.