Abstract. This paper introduces a new technology of exhaust treatment: dielectric barrier discharge plasma technology. Non-thermal plasma (NTP) has been studied as a potential candidate for diesel engine exhaust after-treatment, and the NTP reactor was the critical component in the technology. Research shows that, combined the NTP catalytic purification technology with the existing purification technology could overcome the shortcomings of existing catalyze, improve the efficiency of the engine exhaust particulate matter, hydrocarbons and nitrogen oxides, and has a wide application prospect.