The coating zone (Ni-Cr-Al) on an aluminum alloy surface was clad by a 5 kW CO2 laser. The SEM and TEM observation revealed that there were amorphous structures in the laser cladding. The amorphous structures exhibited two different morphologies. One was space curved plate-like, which existed in the white web-like structures. The other was fir leaf-like, which existed in the grain-like structures.