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Short glass fiber reinforced polyamides (SFRPs) are a choice material for automotive industry, especially for in the engine compartment. To develop their application field to more and more complex hydrothermal and mechanical environments, reliable or even predictive simulation technologies are necessary. Integrative simulation takes into account the forming process during final Finite Elements Analysis (FEA). For SFRPs, injection molding is taken into account by computing glass fibers orientation. It is further used to compute a specific anisotropic constitutive model on each integration point of FEA model. A wide variety of models is now available. Integrative simulation using Digimat has been proved very efficient for static and dynamic loadings.