Abstract: Great floor water inrush happened six times at west main roadway in Liujialiang Coal Mine of Xuangang Mining Area in 1980s. The water inrush locations were the places of high intrusion, which weakened water-blocking ability of floor aquiclude. At present, the coal seam 5^# in working face 5124 was "three-soft" coal seam, and this condition brought more threats to safety production. According to the water inrush conditions induced by "three-soft" coal seam with high intrusion, it carried out simulation research for progressive intrusion of floor aquiclude with similar materials and the FLAC^3D software, which revealed the whole process of water inrush and provided a certain theoretical basis for the prevention and control of the floor water inrush in "three-soft" coal seam with high intrusion．