The　influence　of　cement　raw　meal　on　the　NO　reduction　by　biomass　char　at　a　high　temperature　of　900　with　four　O2　concentrations　of　1%,　3%,　5%　and　8%　was　investigated　in　a　laboratory　scale　fixed　bed　quartz　reactor.　The　results　showed　that　the　cement　raw　meal　had　certain　positive　effect　on　NO　reduction　by　biomass　char　which　promotes　dissociation　adsorption　of　NO　with　the　help　of　CO　consumption　and　oxygen　transferred　to　carbon　surface,　however,　it　also　shows　some　negative　effect,　and　the　degree　depends　on　O2　concentration.　A　long-time　and　high　NO　reduction　rate　was　obtained　in　the　case　of　1%　O2　concentration.　©　2020　Trans　Tech　Publications　Ltd,　Switzerland.