Abstract: To explore the water channel in southeast boundary of Huoluowan Coal Mine 2^-2 coal, in geophysical anomaly areas and inconspicuous anomaly areas, we arranged 17 drillings and exploration results showed that gob roof had not been completely collapsed, and part of it is in the suspended state. In No.1, No.3, and No.4 areas, there are different degrees of longitudinal cracks and fracture zones in the area of the overlying bedrock and roof. No. 2 area is undeveloped area, and drilling peep test proves that the internal rock structure is complete, do not appear crack and collapse phenomenon. In order to eliminate the influence of old goaf water and mined-out mining, the method is intended to adopt the paste material and cement slurry filling and grouting to form an effective water proof curtain to achieve the purpose of coal mine safety.