Abstract: The mechanical behavior and structural response of materials under finite deformation are analyzed by using an elasto-plastic damage constitutive model. The constitutive equation of the present model is transformed into a linear format, and implemented into the finite element simulation tool ABAQUS. For the aluminum alloy 6061-T6, two kinds of structures are modeled for numerical simulation. From the comparison between the simulation and experimental results, it is found that the present model has the ability to describe the deformation processes and structural response of material. Based on the theory behind the present model, complicated deformation behavior beyond the elastic stage is also analyzed.