Abstract: In combination with the specific engineering geological conditions of some mining faces which were under the threat of confined water, the powerful fluid-solid coupling function of FLAC^3D software is used to have a fluid-solid coupling numerical simulation in the mining face, and the coal floor rock strata displacement in mining process, stress distribution laws and progressive intrusion height of aquifer confined water in aquifuge are anlyzed through the simulation results. Combined with the "down three zones" theory, whether there is a complete aquifuge under the action of confined water is used to judge whether work face will burst water or not,which have certain reference function to fluid-structure coupling numerical simulation above water .