The numerical simulation of Additive Manufacturing and especialy the Selective Laser Melting (SLM) constitute a real challenge for nowadays methods. This arise from the multiscales and multiphysics aspects appearing during the process. The aim of this paper is to use the Arlquin modeli- sation framework to take into account this complexity, to better understand the process and to obtain the final properties of a SLM part. The final goal of this modelisation is to be able to determine the optimal process parameters for its control, stability and the desired specifications.