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Polycrystal plasticity model can reflect the material’s microstructure and various mechanical response, but it is too complecate for great computation. The phenomenological elasto-plastic constitutive model is relatively simple, as yet based on the additive decomposition of deformation rate tensor of phenomenological elasto-plastic constitutive model under the condition of large deformation will bring error. In this paper, the uniaxial tensile test process of pure aluminium and single crystal aluminium have carried on the calculation based on the polycrystal plasticity finite deformation elasto-plastic finite element method(CPFEM) and phenomenological elasto-plastic constitutive model, and compared the results of two models. It is researched that effect of calculation error about the deformation amount to the phenomenological elasto-plastic constitutive model. The results show that the stress-strain curve of pure aluminium calculated by phenomenological elasto-plastic constitutive model began to cause error when true strain exceeds 25.5%, and increases with increasing of strain. Polycrystal plasticity model reflect the anisotropy of deformation, texture and residual stress during large drformation of pure aluminium and single crystal aluminium.