Its purification mechanism includes two aspects: first, in the process of plasma generation, the instantaneous high energy generated by high frequency discharge is enough to break the chemical bonds in some harmful gas molecules, so that they can be decomposed into simple atoms or harmless molecules; Second, the plasma contains a large number of high-energy electrons, positive and negative ions, excited particles and radicals with strong oxidation. These active particles collide and combine with some smelly molecules, and under the action of electric field, the smelly molecules are in an excited state. When the energy obtained by the odor molecule is greater than the binding energy of its molecular bond energy, the chemical bond of the odor molecule is broken and directly decomposed into simple atoms or harmless gas molecules composed of a single atom. At the same time, a large number of ·OH, ·HO2, ·O and other active radicals and O3 with strong oxidation ability are generated, which react with harmful gas molecules and eventually generate harmless products.