Abstract: Ni CoCr layer were prepared on the surface of NiCr15Fe alloy using high-speed laser cladding technology, and the effects of different laser powers and scanning speeds on the macroscopic morphology and dilution rate of the layer were investigated. The microstructure, composition distribution, and hardness of the layers were characterized and analyzed using SEM, XRD and microhardness tester. The results show that the width and dilution rate of the layers increase with the increase of laser power, and decrease with the increase of scanning speed. The layers can be divided into fine grain zone, equiaxed crystal and columnar crystal mixed zone, and columnar crystal zone. A bright band consisting of σ（FeCr） phase is formed between the layer and the substrate. With the increase of laser power, the microhardness initially decrease and then increase,with the maximum microhardness reaching 286.6 HV when the laser power is set to 1.9 kW. With the increase of scanning speed, the microhardness also show a similar trend of first decreasing and then increasing, achieving the highest microhardness of 321.9 HV when the scanning speed is 120 mm/s.