A series of rare-earth oxides La_xCe_1-xCuMn/γ-Al₂O₃ supported catalysts were prepared by impregnation methods. Taking CO and C₃H₈ oxidation as a probe reaction, the different x values and active component loadings on the catalyst for CO and C₃H₈ oxidation were investigated. The experimental results demonstrate that the catalysts (x=0.4 and amount of active component=15.04 %) have a lower light-off temperature, and the CO and C₃H₈ conversion is a bove 99%. These catalysts were characterized by means of XRD, TEM and BET tec hniques to verify the species present in the catalysts. The results show that this catalyst has a high surface area, and the size of the active component is much smaller than nanoscale, and is highly dispersed on the nano-fibrous γ-Al₂O₃.