High surface area powders, La0.9Sr0.1CoO3 (LSCO), were prepared by a hard template method with a template of SBA-15. In the preparation process, the solvent was ethanol, the mixture of ethanol and water, and water, respectively. Characterizations were performed to understand the properties of the catalysts. When the solvent is a mixture of ethanol and water, the prepared LSCO has the most easily extracted surface adsorbed oxygen in the H2 atmosphere, exhibiting the best light-off performances for CO oxidation. However, the LSCO prepared in ethanol solvent has the best lattice oxygen mobility, resulting in the best light-off performance for C3H6 oxidation. Moreover, the LSCO prepared in ethanol also shows the best catalytic activity for both CO and C3H6 oxidation under the conditions of simulated diesel exhaust. Furthermore, Pd was impregnated on the LSCO, which was prepared by a sol-gel method and a hard template method, separately; the later one shows higher CO and C3H6 catalytic oxidation activity.