Using the technique of strong electric field ionization discharge, O2 are ionized, decomposed, and introduced into high activity radicals and O2/H2O is turned into the initiator. SO2 and NOx are oxidized into the droplets of H2SO4 and HNO3 by radicals and the initiator is injected into the reaction chamber with no absorbent and catalyst. It is shown that the mole concentration ratio of oxygen radical to SO2 and NOx is the decisive factor. NOx is removed firstly, and SO2 starts to be removed when the removal rate of NOx reaches an optimal value, with n being 2—3. The temperature is a main influencing factor for SO2 and NOx removal, a lower temperature is better. H2O plays an important role in forming hydroxyl radical and improving the removal process of SO2 and NOx.