According to the principle of atomizing corona discharge, a cooking fume purifier was made, and the volt-ampere characteristic curve of atomization condition and non-atomization condition, purification efficiency and discharge current were studied. The results showed that the discharge current of atomizing corona discharge was higher than the non atomizing corona discharge current, either positive or negative corona discharge; it was not conducive to the purification of earthed negative corona discharge cooking fume purification weather the flow too large or too small; cooking fume purifier efficiency were decreased with the increase of wind speed under both condition; the efficiency and the discharge current of atomizing corona discharge cooking fume purifier was almost unchanged with the increase of application time, while both of them decrease under the non-atomizing corona.

By using two forms of magnetic field to have an effect on negative corona discharge, the influence of magnetic field on different interelectrode area of corona discharge was studied. The research showed that the charging intensity is changed and the discharge current is increased when the magnetic field is applied to the corona zone. But the discharge current is not changed when the magnetic field is applied to the charging region. This well explained the reasons for the increase of the discharge current. Meanwhile, the research shows that the onset voltage of negative corona discharge is decreased when the magnetic field is applied. The main reason is due to that the electric field intensity of the corona region is enhanced when the magnetic field is applied.