Abstract: In situ Ni3Al and NiAl intermetallic compound composite laser cladding coatings were prepared on H13 hot die steel surface by controlling Al content in the Ni-based self-fluxing alloy powder. The chemical composition and phase structure of the different laser cladding composite coatings were characterized by optical microscopy (OM) and X-ray diffraction (XRD). The results indicate that the four kinds of composite laser cladding coatings all show a smooth, dense and without obvious defects macroscopic morphology. The dendrite region becomes wider and the dendrite size gradually becomes thicker in the laser cladding coatings bottom with the increase of Al content, even a columnar crystal phenomenon can be found. Without Al, the main phase of the composite coating is Ni3Fe and Ni-Cr solid solution. While with the increase of Al content, the main phase changes from Ni3Al intermetallic compound and Ni-Cr solid solution to Ni3Al+NiAl intermetallic compound and Fe-Cr solid solution, and then to NiAl intermetallic compound and Fe-Cr solid, when the Al content increases to 13.9%. At the same time, the impurity phase in laser cladding coating decreases with the increase of the Al content. The cladding coatings friction coefficients are lower than those of the H13 steel substrate. The highest microhardness of the coating increases by 250% and the abrasion resistance increases by 480% respectively.