Abstract: Several mining areas of YanZhou coalfield now is prepare for mining deep coal seam. For high crustal stress and high water pressure, deep coal seam mining is more difficult than the shallow one. Taking XingLongZhuang coal mine as example, use FLAC3D to simulate the process of coal seam mining repeatedly near the fault under high crustal stress condition. Get the distribution diagram of vertical displacement, vertical stress and plastic zone of surrounding rock. Analysis the difference of the distribution diagram of vertical displacement, vertical stress and plastic zone between the first time mining and the second time. By observe whether plastic zone distribution range had contact with water-bearing fault, the critical distance of water inrush from coal seam floor was got. Compared with the calculation result using the method in national standards, both are basically consistent. This study has important academic and practical significance for the mine water control work and determine the width of the protection coal pillar.