A series of naometric perovskite catalysts LaCo1-xPdxO3 (x = 0, 0.01, 0.03) were prepared via a solution combustion synthesis route using metal nitrates as oxidizers and urea as fuel. It is essential to add a certain amount of ammonia aqueous solution to Pd2+ ions solution in the catalyst preparation process. Homogeneous nano-particles LaCo1-xPdxO3 catalysts with the sizes in the range of 68-122 nm were obtained and characterized by using of XRD, BET, H-2-TPR, XPS, SEM and TEM. Pd was successfully introduced into the LaCoO3 perovskite lattices. Further information was obtained by using XPS upon the LaCo0.97Pd0.03O3 (with NH4OH) sample after H-2-TPR. The results revealed that surface Pd was reduced to the metallic state at the end of the first step in the H-2-TPR experiment, and some surface Co could be reduced to metallic Co simultaneously. The catalytic properties were investigated for simultaneous NOx-soot removal reaction. The performance of LaCo1-xPdxO3 catalysts were greatly improved by the partial substitution of Pd. The maximum NO conversion into N-2 and the ignition temperature of soot are 32.8% and 265 degrees C, respectively.