Abstract: The thermo gravimetric and kinetic characteristics of particulate matter (PM) of diesel engine fueled with 0# diesel and ethanol diesel were studied by using thermo gravimetric analysis (TGA). Results show that adding ethanol to diesel fuel can help reduce the PM emission of diesel engine. The carbon oxidation mainly included three stages, water evaporation, oxidation of soluble substances and solid carbon oxidation. The contents of solid carbon and soluble substances were about 70% and 25% of total PM. The activation energy of PM of diesel engine fueled with 0# diesel was 130.3 kJ/mol, and that of ethanol diesel was 122.9 kJ/mol through the kinetic analysis by Coats-Redfern method. The linear regression coefficient of two fitted curves was over 0.99. The research can provide a theoretical basis for the development of efficient particulate matter catalysts and appropriate selection of renewable technologies of diesel particulate filter.