Silicon carbide power devices operate at high-temperature for a long time, which leads to thermal aging of silicone elastomer, a packaging material, that reduces dielectric strength. The insulation performances of packaging materials are closely related to their space charge characteristics. Therefore, studying the space charge characteristics of silicone elastomer under the influence of thermal aging is important. In this study, the Pulsed Electro-Acoustic Method (PEA) was used to determine the space charge distributions of silicone elastomer of different aging time. The results show that while aging, space charge accumulation and the depth of charge injection in silicone elastomer first decreases and then increases. By analyzing the dissipation law of space charge and combining it with the isothermal relaxation theory, the trap characteristics inside the samples with varying aging time were analyzed. The research results show that there is a general reduction of deep trap density in the aged silicone elastomer, while the density of shallow trap first decreases then increases, contributing to harder, then easier charge accumulation and dissipation while aging.