The inquiry is focused on laser cladding carrier gas coaxial powder nozzle. A three dimensional (3D) model of threechannel laser cladding nozzle was established, and the numerical analysis for the key parameters affecting the laser cladding powder feeding nozzle by employing computational fluid dynamics (CFD) theory was performed, and the numerical simulation was carried out on powder flow field under different conditions such as powder feeding channel diameter, different inclinations and powder feeding port based on commercial CFD software FLUENT. The results of analysis and computation indicate, by keeping other conditions of parameters fixed, it is beneficial for the improvement of the effect of laser cladding when sampling powder feeding channel inclination angle is 70° and the diameter of powder feeding port is 1.5 mm, which opens the gateway for the application of CFD technology in analysis of fluid machinery.