For the purpose of developing the new engineering materials such as tribomaterials, the tribological properties of carbon (CF) and aramid fiber (KF) reinforced polyamide 66 (PA66) composites were investigated. These hybrid composites (CF/KF/PA66) were melt-mixed by a twin screw extruder and injection-molded. Their mechanical properties such as tensile, Izod impact and tribological properties were evaluated. Tribological properties were measured by a ring-on-plate type sliding wear tester under dry condition. The tensile strength and modulus of CF/KF/PA66 composites slightly increased with increasing CF contents although elongation at break and Izod impact strength of these hybrid composites did not change much. On the other hand, the tribological properties such as frictional coefficient and specific wear rate of these hybrid composites showed the different tendencies. The frictional coefficient of these hybrid composites decreased with increasing CF. However, the specific wear rate of these hybrid composites had the minimum peak and showed the curve like as “U” shape. Thus, the filling the combination of CF and KF were effective for the reducing in wear, which is called hybridization effect. This may attributed to be due to the change in the mode of wear mechanism by the filling combination of CF and KF. As a result, the forming of the transfer film on the counterface and the shape of wear debris. It follows from these results that it may be possible to develop the new engineering materials with sufficient balance between mechanical and tribological properties.