Abstract: The chemical property of La_1-xSr_xCo_1-yMo_yO₃ Type oxidation catalysts has been studied. It was found that their cata-lystic properties could be greatly affected by their chemical composition. With the increase of Se²⁺ content in A site or Mo⁺⁶ content in B site of the catalyst, its activity for C₆H₁₄ oxidation and sulfur resistance increased.La_0.6Sr_0.4Co_0.98Mo_0.02O₃ is the best catalyst, which is hopeful for the treatment of waste gas containing sulfur.