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T矿A工作面南部边界为FD断层.2003年留设50米防水煤柱已经实现A上工作面2煤安全带压开采.A工#作面开采时,8#煤底板与奥陶系间距更小,工作面沿FD层一侧将承受更大垂向和侧向奥陶系水压,FD断层防水煤柱留设是A安全开采的重大问题.文章分三种情况讨论、计算FD防水煤柱尺寸,探讨留设防水煤柱的合理性.结果表明:已留设的50m防水煤柱较合理.“,”The boundary of A working face's south is FD fault. The 50m safety pillar against water-inrush designed in2003 has realized safety area mined of 2# in A working face. When A working face is mined, the space between 8# coal floor and Ordovician has become small. The design of safety pillar against water-inrush through FD stop sill faults is the problem of A mine because FD faults will bear much hydraulic pressure from vertical section and side direction in Ordovician. This paper indicates the rationality of design of safety pillar against water-inrush based on three situation and calculating size of FD safety pillar against water-inrush. The result shows that 50m safety pillar against water-inrush designed in2003 is rational.