The effect of TiO2 and SiO2 on the mechanical and tribological properties of carbon fiber(CF)/UHMWPE composites were investigated on UMT5 friction and wear testing machine and universal testing machine,respectively.The morphologies of the fractured surface and worn surface were examined using a scanning electron microscope.The results show that the incorporation of TiO2 and SiO2 can obviously improve the interfacial adhesion between the carbon fiber and the resin,thus the mechanical properties of CF/UHMWPE composites were improved.Among the three kinds of composite materials,the CF/UHMWPE composite material with TiO2 has the best wear resistance.The addition of nano TiO2 and SiO2 can effectively disperse the stress concentration on the surface of carbon fiber,thus improving the wear resistance of composite materials,and making the wear mechanism of CF/UHMWPE composites change from severe plastic deformation to slight plastic deformation.