The Cr2Nb/CuCr composites with different Cr2Nb contents were prepared by the vacuum sintering and infiltration method. The microstructure of the composites was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM), and the effects of in-situ synthesized Cr2Nb on the surface arc motion and erosion morphology of the composites were studied by high speed photography and scanning electron microscope (SEM). The results show that the addition of Cr-Nb composite powder causes a significant improvement in the hardness, conductivity, chopping current, arcing life and breakdown strength. The addition of 7wt% Cr-Nb composite powder can make the cathode spots of the Cr2Nb/CuCr composite distribute more dispersively, decrease the chopping current and prolong the arcing life obviously. In comparison with conventional CuCr alloys, the Cr2Nb/CuCr composites present better overall performance.