Abstract： Fillers, when added to polymer systems, are known to cause a considerable change in dynamic behaviors especially for fumed silica with tridimensional network. A torsional strain-controlled rheometer named rubber processing analyzer (RPA) was used for measuring the dynamic rheological properties of high-temperature vulcanites (HTV) with molecular weight of 600000 g/mol at a certain temperature and frequency. And the differences in aggregate network of fumed silica dispersed in the filled silicone rubber were also investigated by RPA. The results indicated that the shearing and loss modulus of filled silicone rubber with more developed aggregate network showed more strain dependence. And the fumed silica with more developed aggregate network showed a better reinforcement to HTV.