Abstract: There are two main control technology routes for non-Road Ⅳ diesel engines: DOC+DPF+SCR and EGR+DOC+DPF.Due to the PN limit in National Ⅳ emission standards, DPF technology becomes the first choice.This paper analyzes the influence of diesel exhaust temperature on DPF regeneration, the influence of diesel exhaust flow on DPF regeneration, the influence of NO₂ content in diesel exhaust on DPF regeneration, the influence of O₂ content in diesel exhaust on DPF regeneration, the influence of different particles on DPF regeneration characteristics.This paper describes the important influence of DPF regeneration on the performance of China diesel engine, and provides help for the optimization of DPF structure of non-road China diesel engine and the use of China Diesel tractor.