A series of 5A-zeolite supported Rh catalysts were prepared using conventional impregnation method and their catalytic performances for CO preferential oxidation (PROX) in the presence of H2-rich steam were investigate extensively. The effects of calcination temperature, Rh loading amount and the existence of moisture have been studied in detail. 1.2Rh/5A catalyst calcined at 400 oC showed an attractive catalytic performance, CO can be completely converted at 110oC with a high selectivity of 70%. The structural characters of the Rh/5A catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron Microscopy (TEM). The characterization results show that the high dispersion of Rh particles and reasonable pore size of 5A-zelite can be responsible for the attractive performance.