In order to investigate the applicability of constitutive model to unbound granular material (UGM) base asphalt pavement, strain tensor update algorithm and finite element program of UGM constitutive model were developed and applied to ABAQUS finite element software, and the calculated results were compared with the measured ones in the field. The results show that the calculated convergence modulus distribution of UGM is extremely nonuniform. The calculated bottom strain or stress or the maximum shear stress within the asphalt layer with Uzan model is bigger than the calculated ones with linear elastic or kθ UGM models. The calculated bottom strain of asphalt layer with the Uzan UGM model is the closest with measured value by comparing with the measurements in the field.