The effect of magnetic held on NOx removal characteristics from a model combustion gas has been experimentally investigated using a DC corona discharge reactor with a multipoint-plate geometry. The experiment was conducted for a simulated flue gas (NO:0.17%, N-2:99.83%) and the NO concentration and gas flow rate were varied during the experiment. The results showed that the magnetic held was closely related to the NOx removal characteristics. In case that the magnetic field was applied at a right angle to the electric field of discharge domain, the discharge power decreased. The NOx removal efficiency decreased with increasing the gas flow rate. The NOx removal efficiency with the magnetic field of 0.27 (Tesla:T) was 92(%) bellow 1000 (ppm). The NOx removal efficiency was 64(%) at the NOx concentration of 1350(ppm) and was improved into 92 (%), when humidity was increased as the absorbent and magnetic held was increased to 0.36(T). The energy yield increased with increasing the magnetic flux density and decreased with increasing the discharge power.