Bauxitewith　a　large　surface　areawas　successfully　prepared　fromnatural　bauxite　using　a　hydrothermal　process.　Both　0.5%　Pd/bauxite　and　0.5%Pd/Al　2O3　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　N2　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,　153m　2　g-1　and　0.23　cm3　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.