Abstract: Sparks plasma sintering (SPS) process was used to prepare copper matrix composites reinforced with different ratios of carbon nanotubes(CNTs) and TiB₂ hybrid. Density, hardness, electrical conductivity, thermal conductivity and microstructure of the composites were compared and analyzed. To investigate the effects of hybrid ratios on the arc erosion behavior of CNTs-TiB₂/Cu composites, electrical contact test was carried out at different currents. The results indicate gradual decrease in relative density, hardness, electrical conductivity and thermal conductivity, and an increase in separation of the copper grains with the increasing hybrid ratios. Arc erosion resistance of CNTs-TiB₂/Cu composites is improved with appropriate ratios of CNTs to TiB₂ under a certain current. The CNTs-TiB₂/Cu composite with 4:1 hybrid ratio of CNTs to TiB₂ has the lowest average making-arc-energy, average making-arc-durations and material transfer amounts at 5 A and 10 A, while the CNTs-TiB₂/Cu composite with 1:4 hybrid ratio of CNTs to TiB₂ has the lowest average making-arc-energy, average making-arc-durations and material transfer amounts at 15 A. The molten pool, pores and spread out of molten metal are formed on the cathode after arc erosion. Furthermore, molten pool, pores and spread out of molten metal decreases as the ratios of CNTs to TiB₂ increase.