Abstract: In order to solve the problems caused by top-coal caving region of roadway at fully mechanized caving mining area, based on the analysis of the cause of the top-coal caving region, the damage caused by the top-coal caving and the shortage of the traditional support, we develop inorganic foam filling material, use screw pump to pulp, and pump slurry to fill top-coal caving region. The results show that the double liquid inorganic foaming material has the properties of quick setting, light weight, crack resistance and complete flame retardant, which is suitable for filling material in top-coal caving region; the enclosed structure of screw pump prevents air bubbles escaping and overcomes the defects of "bucket type" open suction pulp, slurry, bubble serious separation; the results of the industrial test show that the filling body is closely related to the coal rock mass and the filling effect is remarkable.