We have studied the catalytic combustion of soot particulate over perovskite-type oxides prepared by magic acid method. The catalysts were modified to enhance the activity by substitution of metal into A or B site of perovskite oxide. In addition the reaction conditions, such as temperature, O₂ concentration, space velocity have been studied. The effect of SO₂ pretreatment and water introduced into reactants were also examined. In the LaCoO₃ catalyst the partial substitution of alkali metals into A site enhanced the catalytic activity in the combustion of soot particulate and the activity was shown in the order : Cs>K>Na; In the La_0.6Cs_0.4CoO₃ catalyst the substitution of Fe or Mn showed no effect on the ignition temperature. The ignition temperature decreased with increasing O₂ concentration and contact time. The introduction of water into reactants feed decreased the ignition temperature and the pretreaeent of SO₂ showed no effect on the catalytic activity.