To　improve　the　removal　capacity　of　(NO　+　O-2)　effectively,　the　K-CMK-3(x)　(KNO3:　CMK-3　mass　ratio　(x)　=　10-20　wt%,　in　which　CMK-3　is　an　abbreviation　of　the　ordered　mesoporous　carbon)　samples　were　prepared,　and　their　physical　properties　and　(NO　+　O-2)　adsorption　performance　were　determined　by　means　of　analytical　techniques,　such　as　XRD,　TEM,　BET,　TG,　TPD,　and　DRIFTS.　The　ordered　mesostructures　were　retained　and　specific　surface　areas　and　pore　volumes　of　the　K-CMK-3(x)　samples　increased　after　doping　of　K.　Moreover,　the　doped　K　species　were　uniformly　distributed　on　the　surface　of　CMK-3,　and　K　doping　increased　the　amount　of　the　basic　sites　in　the　sample.　The　structure　and　amount　of　the　basic　sites　were　the　main　factors　influencing　the　(NO　+　O-2)　adsorption　on　the　sample.　The　sequence　in　(NO　+　O-2)　adsorption　performance　was　as　follows:　K-CMK-3(15)　(143.8　mg/g)　＞　K-CMK-3(20)　(127.6　mg/g)　＞　K-CMK-3(10)　(103.6　mg/g)　＞　CMK-3　(88.8　mg/g),　with　the　K-CMK-3(15)　sample　possessing　the　best　adsorption　performance.　There　were　two　main　adsorption　pathways　during　the　process　of　(NO　+　O-2)　adsorption:　one　pathway　was　the　conversion　of　NO　and　O-2　to　a　large　number　of　NO2,　in　which　part　of　NO2　was　weakly　adsorbed　on　the　surface　hydroxyl　groups,　and　the　other　part　of　NO2　was　disproportionated　to　NO,　NO2-,　and　NO3-;　and　the　other　pathway　was　first　the　direct　oxidization　of　NO　to　NO2-　by　the　oxygen　functional　groups　in　carbon　and　then　some　of　the　formed　NO2-　species　were　converted　to　NO3-.