A new simulation strategy using the Discrete Element Method(DEM) based on spherical particle contact mechanics to tillage soil dynamics was proposed. Several suitable selected particle interaction models for different soil types were briefly introduced, including dry particle models with or without adhesion and wet granule models with Newtonian or non-Newtonian fluids, of which the models for non-Newtonian fluids have recently been found by the authors. Feasibilities and several key techniques, as well as their possible solution for such simulations, were discussed. The importance of this new approach would update the understanding of the mechanical mechanism of tillage processing, and promote the development of soil dynamics and the premium design of tillage machine tools.