Abstract: A low-temperature（100℃） regeneration test of a diesel particulate filter（DPF） which has captured particulate matter（PM） were carried out using a non-thermal plasma（NTP） injection system.The particles deposited in the DPF channels at different regeneration stages were sampled and analyzed by thermogravimetric analysis（TGA）,transmission electron microscope（TEM） and Raman spectroscopy to investigate the oxidation characteristics,nanostructure and graphitization degree of particulate sediments.The results show that as the DPF regeneration process proceeds,the maximum oxidation rate temperature(T_max) and burnout temperature（T_e） of the elemental carbon（EC） components in the DPF channels are significantly reduced.The weaker part of the floc structure of PM is broken first during the oxidation of NTP and then is decomposed into chain structure.The average microcrystalline length of primary carbon particles decreases and the average microcrystalline layer spacing increases.As the NTP active substance O atoms are continuously bonded into the PM,new oxygen-containing functional groups are generated at the edge of PM microcrystalline,which increases the disorder degree and amorphous carbon content of PM samples and improves the oxidation activity of PM.