本文分析了对高层建筑防烟楼梯间及其前室、消防电梯前室或二者合用前室进行机械加压送风的必要性，并在大量实际工程调研和资料分析的基础上，对不同的系统负担层数和送风部位给出了加压送风量；通过对不同计算公式的比较和对主要影响因素的分析，提出了加压送风量计算公式的选择，公式参数的确定及其他设计考虑要点。 This paper analyzes the necessity of mechanically pressurizing and supplying air to high-rise building smoke-proof stairwells and their front rooms, fire-extinguishing elevator pre-combination room or both pre-combined rooms, and based on a large number of actual project investigations and data analysis, it is different. The number of system burden layers and the air supply site give the pressurized supply air volume; through the comparison of different calculation formulas and the analysis of the main influencing factors, the selection of the calculation formula for the pressure supply air volume and the determination of the formula parameters are proposed. Other design considerations.