The accelerated thermal aging of a CSPE were carried out for 0, 80.82, 161.63 days at $100^{circ}C$, which are equal to 0, 40 and 80 years of aging at $50^{circ}C$, respectively. The volume electrical resistivities of the seawater and freshwater flooding were measured through 3-terminal circuit diagram. The volume electrical resistivities of the 0y, 40y and 80y were $2.454{ imes}10^{13}{sim}1.377{ imes}10^{14}{Omega}{cdot}cm$, $1.121{ imes}10^{13}{sim}7.529{ imes}10^{13}{Omega}{cdot}cm$ and $1.284{ imes}10^{13}{sim}8.974{ imes}10^{13}{Omega}{cdot}cm$ at room temperature, respectively. The dielectric constant of the 0y, 40y and 80y were 2.922~3.431, 2.613~3.285 and 2.921~3.332 at room temperature, respectively. It is certain that the ionic ($Na^+$, $Cl^-$, $Mg^{2+}$, ${SO_4}^{2-}$, $Ca^{2+}$, $K^+$) conduction current was formed by the salinity of the seawater. The volume electrical resistivity of the cleaned CSPE via freshwater trends slightly upward with the number of dried days at room temperature. As a result, the $CH_2$ component of thermally accelerated aged CSPE decreased after seawater and freshwater flooding for 5 days respectively, whereas the atoms such as Cl, O, Pb, Al, Si, Sb, S related with the conducting ion ($Na^+$, $Cl^-$, $Mg^{2+}$, ${SO_4}^{2-}$, $Ca^{2+}$, $K^+$) component increased relatively.