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