A　series　of　catalysts　of　three-dimensionally　ordered　macroporous　(3DOM)　Ce0.8Zr0.2O2-supported　gold　nanoparticles　with　controllable　sizes　were　successfully　synthesized　by　the　facile　method　of　gas　bubbling-assisted　membrane　reduction　(GBMR).　All　the　catalysts　possess　well-defined　3DOM　structures,　which　consist　of　interconnected　networks　of　spherical　voids,　and　the　Au　nanoparticles　are　well　dispersed　and　supported　on　the　inner　wall　of　the　uniform　macropore.　The　relationship　between　Au　particle　sizes　and　the　ability　to　adsorb　and　activate　oxygen　was　characterized　by　means　of　O-2-TPD　and　XPS.　The　results　show　that　the　active　oxygen　species　(O-)　and　gold　ions　with　oxidation　state　of　Au+　are　essential　for　soot　oxidation　reaction.　3DOM　Au-0.04/Ce0.8Zr0.2O2　catalyst　with　Au　particle　size　of　2-3　nm　has　the　strong　capability　of　adsorption　and　activation　of　oxygen.　Thus,　it　exhibits　super-catalytic　activity　for　diesel　soot　oxidation,　especially　at　low　temperature.　The　reaction　pathways　of　catalytic　soot　oxidation　in　the　presence　or　absence　of　NO　can　be　outlined　as　follows:　at　low　temperature　(＜250　degrees　C),　the　catalytic　performance　of　supported　Au　catalyst　is　dependent　on　the　Au　particle　sizes.　At　relatively　high　temperature　(＞250　degrees　C),　the　catalytic　activity　is　strongly　related　to　the　NO　gas,　because　NO2　derived　from　NO　oxidation　is　used　as　intermediate　to　catalyze　soot　oxidation.