During the mining of coal II1 in Xinmi coalfield, mine inflow is from cubic meters to a thousand cubic meters an hour with tre-mendous differences, few mines fallen short of designed capacity over the years because of too much water inflow. Based on mining area hydrogeological condition studies, analyzed coal seam water filling characteristics, considered that the coal roof direct water filling aqui-fer is lower Permian Xiashihezi Formation bottom sandstone fissure water aquifer;while coal floor’s from Carboniferous Taiyuan Forma-tion limestone karst fissure aquifer, indirect water filling aquifer is Ordovician karst fissure aquifer. Normally, roof water will not pose a threat to coal mining, disastrous water bursting is mainly from coal floor. Hydraulic connection between Carboniferous limestone aquifer and Ordovician limestone aquifer is rather close, generally, large mine inflow has Ordovician limestone water participation. The Dawei fault made the area’s middle and upper Cambrian limestone directly contact the Permian Shiqianfeng Formation sandstone and shale, cut off hydraulic connection between north and south sides and separated the mining area into two hydrogeological subareas. During the mining depth above+50m elevation, water filling source is mainly from coal roof, no water from floor;until below+50m, mine inflow rela-tively rather large, along with depth increasing, mine inflow has a gradually decreasing trend. The study has guiding and reference signif-icance in mine water filling factor determination and water bursting prevention.%新密煤田在开采二1煤层时，矿井涌水量从每小时数立方米到上千立方米，差别极大，个别矿井因水量太大多年达不到设计开采能力。在研究矿区水文地质条件的基础上，分析了煤层的充水特征，认为煤层的顶板直接充水含水层是二叠系下统下石盒子组底部的砂岩裂隙水，底板直接充水含水层是石炭系太原组灰岩岩溶裂隙含水层，奥陶系岩溶裂隙含水层是煤层底板间接充水含水层；通常情况下顶板水不会对采煤构成威胁，灾害性突水主要来源于煤层底板；石炭系灰岩含水层与奥陶系灰岩含水层水力联系较密切，通常矿井大的涌水都有奥陶系灰岩水参与；大隗断层使得区内寒武系中上统灰岩直接与二叠系石千峰组砂、页岩接触，隔断了南北两侧的水力联系，并将矿区分割为两个水文地质亚区；矿井在开采深度在+50m标高以上时，充水水源主要来源于煤层顶板，底板无水，在开采深度在+50m以下时，矿井涌水量相对较大，随着开采深度的增加，矿井涌水量有逐渐减小的趋势。该研究对确定矿井充水因素，进行突水预防具有指导和借鉴意义。
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