Abstract: In order to study the effect of voltage stabilizer injection on thermal-oxidative aged cables, rejuvenation fluid was prepared and injected into the cable samples. The insulation property changes were investigated. Seven rejuvenation fluid with different added concentrations of antioxidant 300 and ferrocene were prepared and injected into the thermal-oxidative aged cable samples. The electrical tree initiation voltage, DC conductivity and dielectric loss factor of the samples were investigated. Then we performed second aging on part of samples and investigated the oxidation induction time and electrical tree initiation voltage at different aging period. The results indicate that the injection of voltage stabilizer can greatly increase the electrical tree initiation voltage of the thermal-oxidative aged cable. However, the conductivity and dielectric loss factor were also increased. The injection of antioxidant 300can increase the oxidation induction time and improve the thermal-oxidative aging resistance of the cable samples for a long duration. The formula of fluid-polymer diffusion model shows that increasing the injection pressure, raising the temperature, increasing the solubility of the voltage stabilizer in XLPE, and selecting conservative addition are effective measures to ensure the rejuvenation effect.