Based on 3# coal seam located above high pressure water of Ordovician limestone and purposes of realizing safe exploitation of coal resources and protection of karst water resources, guiding principles and technical countermeasures of compensated mining in Qudi Mine were proposed through influence analysis of combination of floor lithology, geological structure, engineering mining and mining conditioins to floor water inrush, which was of important theoretical and practical significance to carry out the study of mining under pressure.