随着矿井掘进深度不断增加，通风从容易时期过渡到困难时期。针对眼前山铁矿井下工作面温度较高、风量小的潜在问题，以-269 m水平为研究对象，提出2种优化改造方案，通过建立眼前山铁矿三维可视化仿真井下通风系统模型，采用矿井通风系统网络分析软件进行三维仿真和网络解算，对通风优化方案进行模拟分析。优化后的通风系统数值模拟结果显示：采用方案一使得-269 m巷道的北部区域风量平均提升1.13 m3/s，温度平均降低0.14 ℃；采用方案二使得-269 m巷道内的整体风量平均提升5.51 m3/s，且开采区附近大部分巷道内整体温度平均降低0.34 ℃。对比显示，方案二巷道内的增风降温幅度更大、影响范围更广。2种方案均起到了对通风系统的优化作用，为国内大部分地下开采矿山的井下通风系统优化治理工作提供了一定的参考价值。

As the depth of mine excavation increases,ventilation shifts from an easy to a challenging phase.To address potential issues of high temperature and low airflow in the underground working face of Yanqianshan Iron Mine,2 optimization plans were proposed with the -269 m level as the research subject.A 3D visualization simulation model of the underground ventilation system was created,and mine ventilation system network analysis software was used for 3D simulation and network calculations to simulate and analyze the optimization plans.Numerical simulation results of the optimized ventilation system showed that Plan 1 increased the average airflow in the northern area of the -269 m roadway by 1.13 m3/s and decreased the temperature by an average of 0.14 ℃ .Plan 2 increased the overall airflow in the -269 m roadway by an average of 5.51 m3/s,with a temperature reduction of 0.34 ℃ in most roadways near the mining area.A comparison indicates that Plan 2 provided a greater increase in airflow and a wider impact range for temperature reduction.Both plans improved the ventilation system,offering valuable reference for optimizing underground ventilation systems in most domestic underground mines.