Abstract: Based on two assumptions that elemental vertical stress remained unchanged in the process of computation and that the principal stresses directions remaind unchanged before and after reduction，the calculation formulas and operation steps of the stress migration method was presented and then be applied to do numerical simulation analysis by ABAQUS． Then，the stress migration law was applied in the slope stability analysis of resettlement project． Preliminarily，the practical application of the research results in enigeering was discussed． Through the analysis of that project example，it concluded that it had good consistency to judge instability taking the displacement mutations， the plastic zone breakthrough and equivalent plastic strain breakthrough as the criterion，while it was slightly larger than the above criterions to taking calculation misconvergence．