To　know　the　rupture　course　and　rupture　range,　we　simulated　the　process　of　rupture　on　the　overlaying　soil　with　soft　interlayer　by　plane　strain　finite　element　method.　Results　show　that　the　overlying　soil　with　a　soft　interlayer　can　obstruct　the　rupture　failure　from　bedrock　up　to　the　earth　surface.　However,　a　soft　interlayer　which　is　deeply　buried,　will　bring　about　a　wider　range　of　the　earth　surface　rupture　failure;　In　addition,　the　thickness　of　the　soft　interlayer　may　have　effects　on　the　rupture　course　of　the　overlying　soil.