* The CpT relationship, temperature of glassing Tg, temperature of melt Tm, and temperature of thermal decomposition Td of polyether sulphone (PES) are obtained by lowtemperature adiabalic cacorimeter (LAC), thermogravimetry (TG), derivative thermogravimetry (DTG), differentiate thermal analysis (DTA), and useful data are provided for the processing, modification and application of PES.