Abstract: The radius of filling aggregate accumulation is small in collapse roadway, the preliminary form time of water-blocking wall is long, at the same time, the water-blocking wall and the weak coal roadway is easily affected by water pressure difference between internal and external water inrush point △p and lose stability after the preliminary form of water-blocking wall. In order to solve the above problems, during filling grouting, the stage of filling aggregate is eliminated firstly, the technologies are used, including the single slurry filling grouting technique by cement and fast water-blocking wall construction technique by large well recirculation. The results show that the diffusion radius of single cement slurry is large and the effective connection of water-blocking wall is quick; the large well recirculation technology has reduced the increasing rate of △p and makes it in the range that the water-blocking wall and weak coal roadway can withstand,it takes 42 days to achieve the construction of water-blocking wall.