According to the stability control problem of No. 5105 large span and high coal wall seam gateway in Datong Tashan Mine, the paper analyzed the span and height of the gateway affected to the stability of the seam gateway. Based on the suspension theory and combined beam theory, a preliminary design was conducted on the support parameters of the gateway. The FLAC^3D numerical simulation software was applied to study the length, diameter, row distance, pre-tension and other factors of the high strength bolt and anchor affected to the support effect. An optimized design was conducted on the preliminary support plan. The site measurement of the the surface dis- placement of the surrounding rock during the gateway driving and the coal mining period were applied to evaluate the support effect. The results showed that the convergence between the two gateway sidewalls and between the roof and floor were 275 mm and 215 mm individually during the coal mining period. The combination support with the high strength bolt ＋ anchor ＋ steel mesh could effectively resist the serious mine pressure occurred by the mining activities and the gateway deformation would be effectively controlled.%针对大同塔山煤矿5105大跨度高煤帮煤巷的稳定性控制问题,分析了巷道断面跨度和高度对煤巷稳定性的影响,基于悬吊理论和组合梁理论对该巷道的支护参数进行了初步设计,采用FLAC^3D数值模拟软件研究了高强度锚杆锚索长度、直径、间排距、预紧力等因素对支护效果的影响,并对初步支护方案进行优化设计,通过现场监测巷道掘进和回采时的围岩表面位移来评价支护效果。结果表明：回采期间巷道两帮和顶底板的移近量仅为275和215 mm,高强度锚杆＋锚索＋金属网的联合支护能有效抵抗采动引起的强烈矿压,巷道变形得到有效控制。
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