Abstract: In order to obtain the pyrolysis mechanism of sewage sludge,the thermal gravimetric analysis is used to study the mechanism of dried sewage sludge from Nangchang Qingshanhu Sewage Treatment Plant.The TG-DTG curve of sludge under the rising temperature rates of 20K/min and 40K/min are obtained.According to the results,the pyrolysis properties of sewage sludge were studied.The data obtained from experiments using differential coefficient methods were processed to determine the pyrolysis mechanism and the kinetics parameters of sewage sludge.