This study investigates the impact of powder flow field convergence characteristics on layer height under different carrier gas flow rates and powder feeding amounts. A gas-solid two-phase flow model was developed using Fluent software and used to simulate the convergence characteristics of the powder flow field under different carrier gas flow rates and powder feeding amounts. The model was validated through experimental testing. The results show that as the carrier gas flow rate increases, the dispersion of the powder flow field at the nozzle outlet also increases and the powder convergence concentration decreases. In addition, as the powder feeding amount increases, the powder concentration field at the nozzle outlet and convergence concentration increase, while the convergence position remains unchanged. The model was found to be accurate as the simulation results were consistent with the experimental results.