In this work, CH4 combustion-CO2 reforming was investigated. In this reaction system, CO2 reforming which is an endothermic reaction occurs together with CH4 combustion which is an exothermic reaction and thus it is anticipated that the temperature lowering of the catalyst bed would be alleviated. The catalytic actions of Pt, Ni and Ce supported on Al2O3 were investigated, and Pt was found to be a very active catalyst for the combustion of the methane as well as for CO2 reforming and steam reforming of methane. It was shown that the sequence of impregnation of the catalyst constituents affected the activity significantly. In the CH4 combustion-CO2 reforming, it is inferred that the combustion occurs in the first place and the CO2 reforming as well as steam reforming follow it. Among the catalysts tested, a Ce-Ni-Pt/Al2O3 catalyst showed the best result: at the CH4 : O2 : CO2 feed ratio of 20 : 5 : 10 and at 800 ℃, 93% of CO2 removal and 98% of CO yield were obtained. As the feed rates of CH4 and O2 increased, the methane conversion and CO2 removal ratio were decreased but the lowering of the catalyst bed temperature was not reduced significantly contrary to the expectation. When the extent of CO2 removal was high, it was observed that the measured bed temperature was lower by 10-30 ℃ than that when no reaction occurred.