Normal sandstone is distributed between coal seam, mudstone and sandy mudstone. Sandstone fissures are not well developed. There are 189 holes exposed in the whole region, of which 8 holes are leaking, with a leaking hole rate of 4.2%. The main leaking parts are sandstone at the top and bottom of coal seam 11 and sandstone at some intervals above coal seam 18. According to the pumping test at the leaking section of sandstone at the top and bottom of No.11 coal seam from No.13 to No.14, the unit water inflow q = q=0.0133 L(s·m), permeability coefficient 0.0389md, water level elevation +23.39m, salinity 2.360gL, water temperature 29℃, water quality