Abstract: In this paper the emphasis is laid on the experimental investigation, description of the influences of bed temperature, O 2 level and operating pressure on emission of N 2O in a coal-fired pressurized fluidized bed combustor(PFBC).An increase of bed temperature gives a decrease of N 2O formation, but slightly affects NO formation.The result of NO emission is different from that in atmospheric fluidized bed combustor(AFBC). An increase of O 2 level can give an increase of N 2O and NO emissions, but the effect of O 2 level on N 2O emission is weaker. With the increase of operating pressure, NO emission decreases remarkably, while N 2O emission increases.