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The accelerated thermal aging of CSPE (chlorosulfonated polyethylene) was carried out for 40.41, 121.22, and 202.04 days at 100°C, which are equivalent to 20, 60, and 100years of aging at 50°C, respectively. The volume electrical resistivities of the accelerated thermally aged CSPE samples for 0, 40.41, 121.22, and 202.04 days were 1.107×1014?2.097×10<SUP>14</SUP>, 7.752×10<SUP>13</SUP>?1.556×10<SUP>14</SUP>, 7.693× 10<SUP>13</SUP>?1.521×10<SUP>14</SUP>, and 7.380×10<SUP>13</SUP>?1.304×10<SUP>14</SUP>Ω·cm, respectively, at room temperature. The permittivities of the accelerated thermally aged CSPE samples for 0, 40.41, 121.22, and 202.04 days were 2.89×10<SUP>-11</SUP>? 3.65×10<SUP>-11</SUP>, 3.40×10<SUP>-11</SUP>? 3.70×10<SUP>-11</SUP>, 3.50×10<SUP>-11</SUP>? 3.82×10<SUP>-11</SUP>, and 3.76×10<SUP>-11</SUP>? 4.13×10<SUP>-11</SUP> F/m, respectively, at room temperature. The EAB (elongation at break) of the accelerated thermally aged CSPE samples for 0, 40.41, 121.22, and 202.04 days were 98.8?101.3, 59.5?60.3, 37.8?39.2, and 41.8?44.3%, respectively, at room temperature. The apparent densities of the accelerated thermally aged CSPE samples for 0, 40.41, 121.22, and 202.04 days were 1.603?1.614, 1.611?1.613, 1.622?1.628, and 1.618?1.620g/㎤, respectively, at room temperature. The measured currents of the accelerated thermally aged CSPE and the standard sample were almost constant after 5 min of applying a 300-V/mm electric field to the CSPE. The V-I slope of the accelerated thermally aged CSPE sample was increased if the applied electric field was increased at room temperature, and the V-I slope of the accelerated thermally aged CSPE was higher than that of standard CSPE.