Taking Ni+Al powder and a small amount of Y2 O3 powder as raw material, on the 20 steel surface the Ni-Al intermetallic compound was cladded by laser. The cladding layer with good quality was obtained. Using optical microscope,scanning electron microscope the microstructure of the cladding coating was analyzed. Using energy dispersive spectrometer, X- ray diffraction the composition and structure of cladding layer were analyzed. The effect of the heat treatment on the microstructure, properties and ordering was studied. The results show that the main phases of the cladding layer are Ni3 Al,γ-(Fe,Al),NiAl,AlNiY and Al2 Y. After heat treatment Ni3 Al phase is changed into ordering from disordering, while the NiAl phase ordering is to be retained.