In order to set up the rational location of the main removing gateway for No. 4301 high cutting height long coal mining face in Sihe Mine and to reduce the coal pillar lost, with the study on the pilot support pressure distribution law of the coal mining face, the rational coal pillar width was discussed. Thus the location of the main removal gateway could be determined. The site observation and numerical simulation combined method was applied to study the distribution law of the pilot support pressure in the coal mining face. The study showed that at the final mining stage of the coal minming face, the peak location of the pilot support pressure in the coal mining face was kept with 8 - 10 m in front of the coal mining face, the influence scope was about 50 m and the serious influence scope was about 20 m. The rational width set for the coal pillar shall be 35 - 45 m. The main removing gateway should be located at 35 - 45 m of the centralized roadway in the mining block. Not only pledged the stability of removal gateway, but also reduced the loses of coal resources.%为了确定寺河矿4301大采高长工作面主撤巷道的合理位置,减少煤柱损失,通过研究工作面超前支承压力分布规律,探讨合理的煤柱留设宽度,进而确定主撤巷道的位置。采用现场观测和数值模拟相结合的方法研究工作面超前支承压力的分布规律,研究表明：工作面末采阶段,工作面超前支承压力峰值位置保持在距工作面8～10 m处,影响范围约50 m,剧烈影响范围约为20 m;合理的煤柱留设宽度应为35～45 m,即主撤巷道应布置在距盘区集中巷35～45 m处,既保证了主撤巷道的稳定,同时也减少了煤炭资源的损失。
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