Products include DOC + DPF assembly, SCR catalytic device, DOC mainly deal with HC, CO and particle surface SOF, while making NO into NO2, improve the efficiency of passive regeneration effect and SCR reaction, DPF capture exhaust particulate matter, through passive regeneration to implement the dynamic balance of PM, under the condition of high temperature to realize active regeneration, the PM of SCR processing NOx in the exhaust emission.This product has the characteristics of high filtration efficiency, high conversion efficiency, low back pressure, easy maintenance and low operating cost.