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以慈林山矿9号煤首采面为工程背景,运用理论分析和现场矿压观测等方法,研究了采场的矿压基本规律.结果表明:该工作面基本顶的初次来压步距平均为34 m,周期来压步距平均为13 m.现场矿压观测数据分析证实了工作面所用支架的合理性.采场的顶板活动规律与采场垮落带范围内的关键层关系密切,该关键层即被认为采场的基本顶,这种观点在现场观测和理论计算对比中得以验证.以上研究结果为9号煤层后续高效回采工作提供有益参考.“,”Taking Cilin Mountain Mine No.9 mining face as a engineering background, a theoretical analysis and pressure observation were applied to study the No. 9 thin seam overburden strata movement. The results showed that the first weighting interval of basic roof was 34m and the periodic weighting interval was 13m. The field observation data had confirmed the reasonable of hydraulic support used in the working face. The behavior of ground pressure was are closely related with the key strata range of caving zone, which viewed that the key layer considered as basic roof was confirmed by comparison of the theoretical analysis result and the actual result. The study results could provide the beneficial references to realize the safety and high efficient mining of the remaining No. 9 coal seam.