Abstract：The similarity theory on coupling of solid and liquid is put forward；and a part of type simulation material has been made. The similarity modeling resemble simulation experiment equipment of 3D coupling on solid and liquid is originated；and the loading system，testing system，mining system，flow area simulation and its testing system have been perfected. Then，using the 3D solid-liquid coupling simulation bedstead，the law for deformation and breakage of coal floor on mining above aquifer of Dongshan Colliery，Taiyuan，has been studied. The law of deformation and the breakage of coal floor vary with coal mining are discussed. The stress and deformation of coal floor are changed dynamically. And the varying frequency，the range of stress and deformation have been analyzed. It provides theoretical foundation for coal mining above aquifer.
