Laser cladding of Ni-based alloy was implemented on the surface of #20 carbon steel specimens by use of NiCrSiB powder. Then, the phase composition of the cladding was investigated by XRD, with its high-temperature wearability investigated on an abrasion-wear tester and its surface morphology observed by SEM. The results showed that cladding has even and compact microstructure that has been integrated metallurgically with #20 carbon steel substrate. The microhardness of the cladding is 3 times greater than the substrate, but its high-temperature wearability is just about one third of the substrate. The reasons why the wearability is improved are mainly the highly metallurgical integration of the cladding with substrate, strengthening due to solid solution and that due to precipitation hardening from borides and boron carbonide.