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Methane reforming reactions such as steam reforming of methane (SRM) and oxy-reforming of methane (ORM) have been carried out over Ni/Ce-ZrO2, Ni/La-ZrO2 and Ni/Si-ZrO2 catalysts. It was found that Ni/Ce-ZrO2 exhibits the highest activity as well as stability among the catalysts tested even though they do not have significant difference in characteristic data such as BET surface area, Ni surface area, H2 uptake and so on. Thus, it was confirmed that the remarkable activities of Ni/Ce-ZrO2 in methane reforming reactions are due to the role of a Ce-ZrO2 support resulting from strong metal to support interaction and high oxygen storage capacity.