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The catalytic performance of perovskite composite oxide catalyst La0.9 K0.1 CoO3 coated on catalyst supports by trnditional solid state reaction method and sol-gel method were investigated by a series of experiments.The result shows that the catalytic performance of the La0.9 K0.1 CoO3 perovskite composite oxide catalyst synthesized by sol-gel method is superior to that synthesized by solid state reaction method, having lower ignition tem-perature of the diesel soot particulates, lower start temperature of NO x treatment, and lower concentration of byproduct CO.