Abstract: GH4169 alloy has high yield strength, corrosion resistance and high temperature oxidation resistance below650 ℃, and adding WC particles to the alloy can strengthen the alloy and further improve the mechanical properties of the material. GH4169 alloy and WC/GH4169 composite samples were prepared by selective laser melting（SLM） technology, and the reinforcement effect of WC particles on GH4169 alloy was studied. The results show that compared with that of GH4169alloy, the mechanical properties of WC/GH4169 composite are significantly improved. The microhardness of the composite samples is increased by 45.1%, the friction coefficient is significantly reduced, and the time-friction coefficient curve becomes stable. Adding WC particles, the original columnar crystal structure becomes thinner and smaller, and the refinement of the dendrite improves the hardness and wear resistance of the composite material.