Abstract: The non-isothermal degradation behaviors of calcium sulfate whisker (CSW)/fluororubber(FPM) composites in nitrogen were investigated compared with those of anhydrous calcium sulfate(ACS)/(FPM) composites by TG and DTG. The kinetic parameters were evaluated by differential method and integral method. The results show that the apparent activation energy E of CSW/FPM composites calculated by differential method is 203.33 kJ·mol^-1, higher than that of ACS/FPM composites(174.74 kJ·mol^-1) and the results suggest that CSW/FPM composites have better thermal stability. The thermal decomposition reaction orders are of the order of 1. The thermal decomposition apparent activation energy E increases with increasing mass loss.