为解决石景山隧道透水事故抢险救援过程中由于既有通风系统不合理，导致作业环境恶化，致使抢险救援工作无法正常进行的难题，对既有通风系统进行了应急优化，并对应急优化后的通风系统进行网络计算和通风效果持续监测。结果表明： 1）在现场可供选择使用的风机中， 22、30、37 kW射流风机安设在横通道均无法满足左右洞的风量需求， 只有160 kW的轴流风机可以满足左右洞的风量需求，且洞内各区段的风速均满足最小风速的要求； 2）通风系统应急优化后，左右洞CO浓度大幅度降低，并持续保持在国家规定的标准浓度以下，通风效果显著，作业环境明显改善。

During the rescue of Shijingshan tunnel flood accident, the working environment deteriorated due to the unreasonable ventilation system, and the rescue work could not be carried out normally. Therefore, the existing ventilation system is optimized in an emergency manner. Meanwhile, network calculation and continuous monitoring of ventilation effect are carried out for the ventilation system after emergency optimization. The results show that: (1) Among the fans available at the site, the 22 kW, 30 kW, and 37 kW jet fans installed in the transverse passage cannot meet the air volume demand of the left and right holes, and only the axial flow fans of 160 kW can meet the air volume demand of the left and right holes, and the wind speed in each section of the tunnel meets the minimum wind speed requirement. (2) After the emergency optimization of the ventilation system, the concentration of CO in the left and right holes is greatly reduced and keeps below the national standard concentration, the ventilation effect is significantly improved, and the operating environment is significantly improved.