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The selective reduction of NO by hydrocarbons in the presence of excess oxygen is a potential route to remove NO from exhaust gases[1,2]. The acidity has been shown to be important in lean NO reduction, and the role of acidity in this reaction is quite different for various catalytic systems[3～9]. In this paper, 15%ZrO2 as the thermal stabilizer is doped into 0.5%Rh/γ-Al2O3, and the synergetic effect between Rh/γ-Al2O3-Zr and solid superacid SO2-4/ZrO2 for NO+C2H4+O2 reaction is studied.