The inherent problems associated with laser cladding remanufacturing process using NiCrBSi alloy powder is the formation of crack. Ni60A alloy coatings manufactured by laser hybrid process parameters cladding on 45 steel were investigated. A considerable amount of network eutectics locate in a large number of intergranular positions of the primary matrix under SEM (Scanning Electron Microscope).The results of EDS (Energy Dispersive Spectroscopy) and XRD (X-Ray Diffractometer) find that the coating has homogenous and fine microstructure consisting of γ (Ni) solid solution, a considerable amount of network Ni3B, M23C6 (M=Fe, Ni, Cr) and M7C3 eutectics, with boride ceramic phase CrB uniformly distributing in interdendritic eutectics. With the decreasing of molten pool cooling rate, the intergranular eutectic hard phase (M23C6, M7C3) decreases, and the tough phase γ (Ni) increases, meanwhile, the metal compound FeNi3 is formed during the cladding process, thereby the toughness of the cladding layer is enhanced. The crack is eliminated when preheating temperature is up to 300 ℃.