La1-xkxMnO3　(x=0,　0.10,　0.15,　0.20,　0.25)　perovskite　oxide　catalysts　were　prepared　by　solvothermal　method.　Various　methods　such　as　XRD,　FT-IR,　SEM,　H2-TPR,　XPS　and　NO-TPD,　were　used　to　characterize　structure,　composition,　surface　morphology,　and　the　redox　properties　of　the　catalysts.　Their　catalytic　performance　of　the　simultaneous　NO　and　soot　removal　was　investigated　in　a　fixed-bed　micro-reactor　under　atmospheric　pressure.　The　results　indicated　that　the　La1-xKxMnO3　catalysts　showed　perovskite　structure.　For　La1-xKxMnO3　catalysts,　with　the　partial　substitution　of　La3+　by　K+　in　the　Mn-based　perovskite　lattice,　a　portion　of　Mn3+　was　transformed　into　Mn4+　and　the　number　of　oxygen　vacancies　was　increased,　leading　to　an　improvement　of　the　redox　properties　and　NO　adsorption　performance.　As　a　result,　the　catalytic　reactivity　of　La0.80K0.20MnO3　catalyst　was　also　improved,　achieving　the　simultaneous　removal　of　NO　and　soot.　The　maximum　conversion　of　NO　(Xmax　NO)　and　the　reaction　temperature　(Tmax)　were　46.5%　and　436　°C,　respectively.　The　ignition　temperature　of　soot　(Tig),　peak　CO2　formation　temperature　(Tmax　CO2)　and　CO2　selectivity　(Smax　CO2)　were　341°C,　454°C　and　98.8%,　respectively.　©　2021,　Editorial　Board　of　China　Environmental　Science.　All　right　reserved.