Water inrush is an important hidden danger threatening the safe mining in Fangezhuang Coal Mine, so finding out the causes of water inrush has important practical significance. Based on the study of the hydro-geological conditions in this mining area, analysis was made on the water filling conditions, water filling channels and water filling strength of 12th coal seam. The results showed that the mine inflow was large and water inrush frequently occurred, but the mine inflow did not change with the seasons;the cracks were the main water filling channel, and the second was the subsided columns and faults; the statistical data showed that the water inflow in the research area had a phase change characteristics of falling down - stable - falling down again since 1989.%煤矿井下突水是威胁范各庄煤矿安全开采的重要隐患，查明突水的原因具有重要的实际意义。在研究矿区水文地质条件的基础上，分析了范各庄矿区内12煤层的充水条件、充水通道及充水强度等，结果显示：研究区具有涌水量大与突水频繁等特征，但矿井涌水量无季节性变化；裂缝为最主要的通水通道，其次为陷落柱和断层；从统计数据来看研究区涌水量自1989年以来具有下降—稳定—再下降的阶段性变化特征。
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