The plastic characteristics of the coal seam floor has been explored in this article on FEM stength reduction with the software of ANSYS, and the plastic area perforation process has been given. The slip scope given on FEM strength reduction are much close to the theoretical solution, the plastic failure fields depth of the coal seam floor is similar to Prandtl type, comparing some parameters with the theoretical solution. The solution error between FEM strength reduction and theoretical solution is less than 10%, which showed that the finite element intensity reduction method used to solve floor damage process is feasible. The scope of its plastic area can be used to reserve the safe thickness in water outburst from coal seam floor and the maximum effective spacing of protected seam.

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