Bauxite　with　a　large　surface　area　was　successfully　prepared　from　natural　bauxite　using　a　hydrothermal　process.　Both　0.5%　Pd/bauxite　and　0.5%　Pd/Al2O3　catalysts　were　prepared　using　an　incipient-wetness　impregnation　method　for　CO　oxidation　reaction.　The　characteristics　of　the　samples　were　determined　by　X-ray　fluorescence,　low　temperature　N-2　physical　adsorption,　X-ray　diffraction,　transmission　electron　microscopy,　H-2　temperature-programmed　reduction　and　X-ray　photoelectron　spectroscopy.　The　average　pore　diameter,　BET　surface　area　and　pore　volume　of　the　bauxite　support　at　the　optimum　hydrothermal　conditions　of　temperature　(170)　and　time　(72　h)　were　found　to　be　approximately　4.82　nm,　153　m(2)　g(-1)　and　0.23　cm(3)　g(-1),　respectively.　The　activity　of　the　0.5%　Pd/bauxite　catalyst　was　much　higher　than　that　of　the　0.5%　Pd/Al2O3　catalyst,　it＇s　due　to　that　Fe2O3　itself　contained　in　bauxite　was　a　good　catalyst　for　CO　oxidation　and　can　interact　with　Pd　in　the　catalyst.