Abstract: In order to improve the surface wearing resistance of corrosion-wearing-prone parts (such as plunger rods and combination valves) of oil production and water injection, in this study, a Ni-Cr-Mn-Ta-Si alloy-powder coating was processed on the surfaces of the plunger rods and combination valves using the laser fusion cladding technology. Then, the surfaces of the valves were analyzed by the X-Ray diffraction physical phase analysis, microscopic morphology analysis, microhardness test, friction and wear performance evaluation, and abrasion analysis. The test results showed that the fusion cladding was mainly composed of Fe-Cr compounds. The diffraction peak counts of the Fe-Cr compounds separately reached 4 684.87 and 4 621.80 cts for the plunger rod and the combination valve, with the crystal plane spacings of 2.03 and 2.04 Å. And the relative strengths of were both 100%. The dendritic, planar and cellular organizations were observed both in the plunger rod and the combined valves, while the heat affected zone showed fine martensite organization. The hardness of the fusion cladding layer of the plunger rod exceeded 500 HV, while the hardness of the combined valves was about 300 HV, which was significantly higher than the hardness of the substrate. The friction coefficient of the sample 1 of plunger rod remained stable above 0.8, while the coefficient of the sample 2 decreased slightly after rapidly reaching the value of 0.85. The F1 and F2 samples of the combination valves showed better wearing resistance, with friction coefficients of 0.6-0.8, while the friction coefficients of the F3 and F4 samples exceeded 1.0, which was poorer in terms of wearing resistance. The abrasion analysis further endorsed the ploughing and adhesive wearing characteristics of the coatings. Therefore, the Ni-Cr-Mn-Mo-Si alloy-powder coating pressed by the laser fusion technollgy could significantly improve the nano-hardness and wearing resistance of the corrosion-prone and wear-prone parts for oil production and water injection.