Abstract: The FEM is applied in research of surface subsidence rule at goaf under the riverbed in Xishimen iron ore In comparison with the drilling data，it is considered that this method can effectively predict the scope and trends of surface subsidence caused by mining Based on the forecast analysis，the riverbed and the goaf under riverbed are treated from three aspects of goaf's filling，shallow fissure grouting and surface sealing，and the scheme above is verified to be effective through numerical calculation.

Key words: Goaf under the riverbed, Numerical calculation, Ground subsidence, Tailing-cemented filling