Abstract: Mixed powders consisted of copper powder and carbon nanotubes (CNTs, its contents was 0.1wt%-0.5wt%) were pre-added on the surface of pure copper to prepared CNTs/Cu laser cladding layer by laser cladding technology, and then the microstructure, microhardness, wear resistance and electrical conductivity of the cladding layer were studied. The results show that, the microstructure of CNTs/Cu laser cladding layer was even and compact, it′s phases consisted of copper and carbon.When the content of CNTs was 0.5wt%, the hardness of the layer was 168 HV0.05, which was 2.3 times as much as the hardness of the copper substrate, and its wear resistance was 3.5 times higher than that of the pure copper. After cladding, the electrical conductivity of the cladding sample decreased to about 70% value of pure copper, and its electrical conductivity had a little relationship with the contents of CNTs.