Starting with the model of the Biot two-phase media theory,the authors set up the 2D/3C velocity-stress elastic wave equation of the two-phase isotropic media and the finite difference time domain scheme through deduction.The wave field simulation is based on the two-phase homogeneous and inhomogeneous isotropic media using the traditional staggered-grid method and the rotated staggered-grid method.The results show that the rotated staggered grid difference scheme performs perfectly for the two-phase isotropic media.A comparison between rotated stagger-grid and traditional stagger-grid demonstrates that the finite difference algorithm of rotating staggered-grid is more stable and can avoid errors caused by interpolation,and hence the rotated staggered-grid difference scheme is a numerical simulation of seismic wave field method with a strong effectiveness.