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Abstract In order to evaluate the influence degree of water damage in Ⅱ1 coal floor of 33 mining area in Peigou Coal Mine, geological and hydrological data of 33 mining areas were sumarized, and the influence of L7-8 limestone aquifer, L1-3 limestone aquifer, Ordovician limestone aquifer and geological structure to mine filling water were analyzed. Under the action of sliding structure, the distance between Ⅱ1 coal seam and Ordovician limestone aquifer was smaller, and the larger fault structure was superimposed, which caused the Ordovician limestone water to be the focus of this area. Critical water inrush coefficient method was used to evaluate the water inrush risk of Ordovician limestone water, and this area was divided into Ordovician water breakthrough threat zone and danger area. At the same time, water inflow in water inrush danger area was estimated, which provided data for water control and safety production of the mine.
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