Abstract: On the surface of 6063 aluminum alloys, using laser cladding technology prepared Ni60 alloy cladding layer with added rare earth CeO2, and by metallographic microscope, XRD, SEM and EDS equipment for the testing and analysis, researched the influence of CeO2 on the phase structure, compositions and other microstructures of 6063 aluminum surface laser cladding Ni-based cladding layer, to explore the effect and mechanism of rare earth oxide CeO2. The results showed that : Adding 5% CeO2 can effectively reduce the cracks and holes of Ni60 cladding layer, so that the cladding layer has a better structure morphology; The main phase structures of 5% CeO2 Ni60 cladding layer and Ni60 cladding layer both are β-NiAl (Cr) and a small amount of NiAl3, Ni3Al, Al, etc; After the addition of rare earth, the intensity of β-NiAl phase (110)、(200)、(211) diffraction peaks and Al peaks are significantly reduced, and there are clear peaks of NiAl3 phase; Compared with Ni60 cladding layer without adding rare earth CeO2, the Ni60 cladding layer added CeO2 have a uniform element distribution, a lower dilution rate; Adding 5% CeO2 can significantly reduce the porosity, refine the grain size and have more diffuse distribution grains at the surface of Ni60 cladding layer, but the effect is not obvious to the microstructure at the bottom of the cladding layer.