If　the　medium　between　rupture　fault　and　ground　layer　is　assumed　to　be　uniform　and　isotropic,　and　the　full　space　radiation　of　the　dislocation　source　is　regarded　as　the　ground　layer　seismic　incident　wave;　the　ground　motion　may　be　simulated　which　considers　the　rupture　process　by　seismic　response　of　soil　using　finite　element　method.　The　calculation　model　area　can　be　reduced　by　this　method　and　the　calculation　efficiency　is　improved　By　comparing　the　analytic　solutions　based　on　the　dislocation　theory　with　the　results　from　FEM,　the　calculation　accuracy　of　his　method　is　proved.