In this article, we have carried out the Ni based self fluxing alloy powder and studied the effect on the laser alloying of 45steel layer which contains different weight percentage of nano-SiC powders. Experimental results show that the alloy layer which obtained by the optimized laser alloying process parameters (I = 38A, V = 100 mm / min, Δf=10mm, Ar gas protection) is smoothness, fineness, hardness and have a good metallurgical bonding. The test of tribological wear experiments shows that the wear capability of Ni-based powder made of laser alloyed layer is more excellent than that of the hardened 40Cr steel. And the tribological wear capability of the Ni-based alloy with SiC made of laser alloyed layer has been further improved. In the same process conditions, the addition of 20% nano-SiC is the best.Salt spray test shows that both the Ni and Ni/SiC composite coatings' corrosion is much stronger than that of the 45steel substrate. But with the added amount of nano-SiC increased the resistance of alloying layer corrosion decreased slightly. Finally, this paper use Grey comprehensive evaluation model to value the quality of the alloy layer. The evaluation vector shows that the laser alloyed layer which added 20% SiC has optimal overall performance.