The hot deformation behaviors of a typical Al-Si-Mg aluminum alloy are investigated by isothermal compression tests at the deformation temperatures of 300-420 oC and strain rates of 0.01-10 s-1. The results indicate that the flow stress sensitively depends on the deformation parameters, which increases with the increased strain rate or decreased deformation temperature. By introducing the stress-dislocation relation, an enhanced Johnson–Cook (EH-JC) model, based on the modified Johnson–Cook (M-JC) model, is established to describe not only the strain hardening, thermal softening, but also dynamic recovery (DRV) behaviors. Additionally, compared with the original JC model and M-JC model, the EH-JC model can possess a good prediction accuracy for characterizing the hot deformation behaviors of the studied aluminum alloy. Thus, the proposed EH-JC model can be applied in the practical industrial forming of Al-Si-Mg aluminum alloy components.