Abstract: A thermoplastic elastomer charging pad experienced bulging during use. The molecular structure of the charging pad material was analyzed using an infrared spectrometer, and the thermal stability of the material was studied using a synchronous thermal analyzer. The microstructure of the bulge was observed using a scanning electron microscope, and its mechanical properties were tested using a universal material testing machine. The results showed that during the charging process, the thermoplastic elastomer charging pad was locally heated and heated, causing the oil and grease in the material to migrate to the surface. At the same time, particles such as color powder and carbonate fillers were also enriched on the surface using oil and grease as carriers. The larger the amount of oil migration, the more obvious the particle migration, and the more severe the bulging phenomenon.