Abstract: A multiphase continuum numerical model based on level-set approach and finite volume method(FVM) was proposed to simulate plasma deposition manufacturing(PDM) process for functionally graded material(FGM).Based on this model, molten pool behavior, temperature field and flow field as well as solute diffusion subjected to a variety of heat power were investigated.The simulation results manifest that heat power has significant influence on the composition distribution and the final property of FGM.An experiment in Al₂O₃-stainless steel FGM deposition verified the validity and feasibility of this simulation.