Abstract：Through the analysis of the water-filled source and the conditions mining under pressure of the main coal seam in Changping Field, the factors including the development degree of Ordovician limestone karst fissures, the distribution law of limestone deposition, the water abundance and its distribution law, the hydraulic connection between aquifers, groundwater recharge and runoff conditions in Changping Mine were studied. The water resistance performance of the coal seam floor was comprehensively evaluated. And the hydrogeological characteristics of Fengfeng Formation and Shangmajiagou Formation were systematically evaluated to determine whether the Fengfeng Formation could be used as a aquifuge or it was made to have the effect of aquifuge through technical means, so as to evaluate and solve the feasibility problem of mining under pressure in Changping Mine. It provides technical support for No. 3 and No. 15 coal seam mining under pressure in Changping Mine.
