Various supported Pt-Pb bimetallic catalysts were prepared and applied for the catalytic conversion of nitrobenzene to p-aminophenol in the environmentally benign pressurized CO_2/H_2O system.Among the bimetallic catalysts prepared,Pt-Pb/SiO_2 is the best and nitrobenzene could be converted to paminophenol with a selectivity as high as 82% when the reaction was carried out using this catalyst at110 ℃ under 5 MPa CO_2 and 0.2 MPa H_2. Various supported Pt-Pb bimetallic catalysts were prepared and applied for the catalytic conversion of nitrobenzene to p-aminophenol in the environmentally benign pressurized CO 2 / H 2 O system. Amm the bimetallic catalysts prepared, Pt-Pb / SiO 2 is the best and nitrobenzene could be be converted to paminophenol with a selectivity as high as 82% when the reaction was carried out using this catalyst at 110 ° C under 5 MPa CO_2 and 0.2 MPa H_2.