Three-dimensionally　ordered　macroporous　Co3O4　(3DOM　Co3O4)　and　its　supported　gold　(xAu/3DOM　Co3O4,　x　=　1.1-8.4　wt%)　nanocatalysts　were　prepared　using　the　polymethyl　methacrylate-templating　and　bubble-assisted　polyvinyl　alcohol-protected　reduction　methods,　respectively.　The　3DOM　Co3O4　and　xAu/3DOM　Co3O4　samples　exhibited　a　surface　area　of　22-27　m(2)　g(-1).　The　Au　nanoparticles　with　a　size　of　2.4-3.7　nm　were　uniformly　deposited　on　the　macropore　walls　of　3DOM　Co3O4.　There　were　good　correlations　of　oxygen　adspecies　concentration　and　low-temperature　reducibility　with　catalytic　activity　of　the　sample　for　CO　and　toluene　oxidation.　Among　3DOM　Co3O4　and　xAu/3DOM　Co3O4,　the　6.5Au/3DOM　Co3O4　sample　performed　the　best,　giving　a　T-90%　(the　temperature　required　for　achieving　a　conversion　of　90%)　of　35　degrees　C　at　a　space　velocity　of　20　000　mL　g(-1)　h(-1)　for　CO　oxidation　and　256　degrees　C　at　a　space　velocity　of　40　000　mL　g(-1)　h(-1)　for　toluene　oxidation.　The　effect　of　water　vapor　was　more　significant　in　toluene　oxidation　than　in　CO　oxidation.　The　apparent　activation　energies　(26　and　74　kJ　mol(-1))　over　6.5Au/3DOM　Co3O4　were　lower　than　those　(34　and　113　kJ　mol(-1))　over　3DOM　Co3O4　for　CO　and　toluene　oxidation,　respectively.　It　is　concluded　that　the　higher　oxygen　adspecies　concentration,　better　low-temperature　reducibility,　and　strong　interaction　between　Au　and　3DOM　Co3O4　were　responsible　for　the　excellent　catalytic　performance　of　6.5Au/3DOM　Co3O4.