Abstract: To study the problem of overlying coal seam working face passing through empty roadway in underlying coal, based on the accident of floor water inrush from the 1002 face of Ji’anda Coal Mine, the influence of empty roadway in underlying coal on overlying coal mining and evolutionary process of floors passing through the empty roadway was analyzed. The results show that after the mining of 10# coal seam, the depth of damage of the floor is 5.54 m, which is larger than the spacing of coal seams by 5.4 m. The empty roadway in underlying coal threatens the water inrush of the overlying coal seam mining. The stress concentration area penetrates the empty roadway when the overlying coal seam working face is 0 m from the empty roadway, the range reaches the maximum, the stress value is the largest at 4 m; when the working face passing through the empty roadway 0 m, 4 m, 8 m, the plastic zone of the left side, roof and right side of the empty roadway goes through the floor successively, and the penetrating width is 2 m, 4 m and 8 m. At this time, the surrounding rock of the empty roadway is destroyed in a large area, floor water inrush occurs extremely easily.