A　two-step　electrostatic　self-assembly　method　was　used　to　first　graft　-NH2　groups　onto　the　Nb2O5　followed　by　loading　of　CdS　QDs　onto　the　NH2-Nb2O5　to　obtain　CdS/NH2-Nb2O5.　The　performance　of　the　samples　under　visible　light　was　evaluated　under　simulated　conditions　of　25　degrees　C　and　varying　relative　humidity　(RHs).　The　results　showed　that　with　the　increase　of　RH,　the　NO　removal　efficiency　by　CdS/NH2-Nb2O5　increased　first　and　then　decreased,　reaching　the　maximum　NO　removal　efficiency　when　RH　=　50　%.　The　selectivity　of　NO2　on　CdS/NH2-　Nb2O5　(9.01　%)　was　significantly　lower　compared　to　that　of　Nb2O5　(24.44　%)　and　NH2-Nb2O5　(19.72　%).　The　introduction　of　-NH2　groups　and　CdS　QDs　significantly　enhanced　visible　light　absorption　and　improved　the　separation　efficiency　of　photogenerated　charge　carriers.　In-situ　DRIFTS　analysis　revealed　that　Cd2+　served　as　an　additional　active　site　for　NO　adsorption.　Furthermore,　CdS　had　a　relatively　negative　conduction　band　position,　which　was　conducive　to　the　generation　of　center　dot　O　2　-　,　further　inhibiting　the　generation　of　NO2.　This　work　provides　a　new　approach　to　the　design　and　preparation　of　catalysts　for　photocatalytic　oxidation　of　NO.