Experiments for simultaneous removals of SO2 and NO were conducted in a laboratory-scale powder-particle Fluidized bed reactor of 0.053m inside diameter and 1.0m in length above the distributor in a temperature range of 573-873K. Fine powders, sorbent of SO2, are continuously fed to the fluidized bed, in which coarse fluidized medium particles are fluidized. Iron oxide dust, a by-product of steel mills which contains considerable amounts of iron oxides, was used as sorbent of SO2 to find a cheap sorbent for removal of SOx. Two kinds of coarse particles of inactive silica sand and active WO3/TiO2 catalyst for removal of NOx were used as particles for fluidized medium. Influences of various operating parameters, including reaction temperature, mole ratio of Fe/S, superficial gas velocity, static height of bed, concentration of SO2 at inlet, concentration of NH3 at inlet and kinds of particles for fluidized medium on removal of SO2 were investigated. Furthermore, the effects of reaction temperature, concentration of NH3 at inlet and kinds of particles for fluidized medium on removal of NO were also studied. Experimental results indicated that the iron oxide dust showed potential capacity as low-cost sorbent of SO2 and weak catalytic activity for reduction of NO. A removal of SO2 of 60% was achieved at temperature of 773K and mole ratio of Fe/S of 3, while a nearly 100% removal of NO was attained when NH3/NO was equal to 1, with the use of catalyst for removal of NOx as particle for fluidized medium.