Methanol is one of the candidates of hydrogen resources for a micro fuel cell system. Fundamental analysis of methanol steam reforming was conducted using a micro reactor. An anodized aluminum plate has high surface area and high thermal conductivity. Therefore authors have been applied it to a catalyst support material. In this study, a micro reactor using a plate type anodized aluminum catalyst (alumite catalyst) was manufactured. An aluminum plate was anodized and the alumite catalyst was prepared using an impregnation method. Two kinds of catalyst, the Cu/ZnO catalyst and the Cu/ZnO/ZrO₂ catalyst were prepared in this study. Then effects of additive of Zr to the Cu/ZnO catalyst on the catalyst property and reactivity were examined. Catalyst loading on the alumite support plate was measured using an Inductively Coupled Plasma Atomic Emission Spectrometry (ICP). The BET-surface area of catalysts was also measured. An temperature programmed reduction (TPR) analysis was conducted. From the TPR analysis, it was found that the dispersion of Cu on the alumite support plate was supposed to be improved for the Cu/ZnO/ZrO₂ catalyst. The reactivity of methanol steam reforming was compared between the Cu/ZnO catalyst and the Cu/ZnO/ZrO₂ catalyst. The Cu/ZnO/ZrO₂ catalyst showed higher reactivity than the Cu/ZnO one. In order to evaluate the effect of thickness of the catalyst support layer, the effective factor was calculated for both catalysts. Those are 0.25 for the Cu/ZnO catalyst and 0.21 for the Cu/ZnO/ZrO₂ catalyst, respectively. These results show that the thickness of catalyst support layer could become thinner.