Two carbon-silica dual phase fillers, CSDPF 2000 and 4000, have been characterized and their applications in tire tread compounds have been investigated. Their main -P is the surface coverage with silica. Compared with CSDPF 2000 series, the silica-surface-coverage of CSDPF 4000 series is considerably higher. This is mainly due to the silica-distribution in the aggregates. While silica domains in CSDPF 2000 are uniformly distributed throughout the aggregates, the silica in CSDPF 4000 is only located on the aggregate surface, forming a shell-like layer. In rubber compounds, both materials show a higher polymer-filler interaction on carbon domains which is desirable for abrasion resistance and lower filler-filler interaction which leads to a lower hysteresis at high temperature, hence lower rolling resistance for tire. With regard to wet skid resistance, the increased silica-surface-coverage of CSDPF 4000 leads to significant improvement for passenger tire, while CSDPF 2000 is favorable for truck tire. Therefore, the tradeoff among rolling resistance, wear resistance and wet skid resistance related to the tread compounds of different tires can be significantly improved by replacing the conventional fillers with different type of CSDPF.