Ultra-high-speed laser cladding technology replaces chromium plating, which can solve the industrial application problem of heavy metal pollution caused by chromium ion (Cr6+) in chromium plating process. Hard chromium plating on the surface of metal workpiece is a combination of corrosion resistance protection and decoration, which has a great application prospect.Hard chromium plating on the surface of metal workpiece is a combination of corrosion resistance protection and decoration, which has a great application prospect.The research and development of ultra-high speed laser cladding technology in China mainly focuses on equipment integration and process experiment research, but lacks the simulation model of cladding process.In this paper, the ultra-high speed laser cladding ring cladding head is taken as the research object, and a CFD simulation model based on unsteady particle tracking technology is established by using FLUENT, and a temperature field model of laser cladding powder for ring cladding head is developed.The ultra-high speed laser cladding process is tested and analyzed. The theoretical model of the process is established.Through simulation results, it is found that powder spots with a radius of 0.8 mm can be formed by ultra-high speed laser cladding ring cladding head, and the powder concentration is the highest in the space of 15 mm~19 mm below the cladding head. The feasibility of the model is verified by experimental comparison.