Wood polymer composites (WPC), have well proven their applicability in several fields of the plasturgy sector, due to their aesthetics and low maintenance costs. However, for plasturgy applications, the characterization of viscoelastic behavior, thermo-mechanical and thermo-physical properties of WPC with the temperature and wood filler contents are essential. In this paper, for thermoforming applications, the processability of composites made up of wood and a matrix of thermoplastic is investigated for six different proportions of wood fibers. To this end, a numerical analysis of the viscoelastic, mechanical and thermo-physical properties of composite composing of high density polyethylene (HDPE) reinforced with soft wood particles is evaluate