Thermal properties of poly(phenylene sulfide amide) (PPSA) prepared using sodium sulfide, sulfur, and thiourea as sulfur sources which reacted with dichloro-benzamide (DCBA) and alkali in polar organic solvent at the atmospheric pressure, were studied. The glass transition temperature (T-g), melting point temperature (T-m), and melting enthalpy (Delta H-m) of the related polymers were obtained by use of differential scanning calorimetry analysis. The results are : T-g = 103.4-104.5 degrees C, T-m = 291.5-304.7 degrees C, and Delta H-m = 104.4-115.4 J/g. Thermal properties such as thermal decomposition temperature and decomposition kinetics were investigated by thermogravimetric analysis under nitrogen. The initial and maximum rate temperatures of degradation were found to be 401.5-411.7 degrees C and 437-477 degrees C, respectively. The parameters of thermal decomposition kinetics of PPSAs were worked out to be : activation energy of degradation was 135 to 148 kJ/mol and the 60-s half-life temperature was 360 to 371 degrees C.