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摘要 ：根据多年来对现行加压送风防烟方案气流模型的探索，通过对防火规范历次版本第6章与第8章相关条文的对比分析，证实了规范第8章加压送风量的计算数学模型和相应的对策措施，都是基于防烟楼梯间没有设置直接对外的疏散出口而提出的。这违反了规范第6章安全疏散章节中关于防烟楼梯间应设直接对外的安全出口的规定，使模型和措施失去了法规上的依据和理论上的支持。根据4种防烟方案加压送风气流的流动特性，提出了当量流通面积流量分配法和流体网络分析法两种新的方法。 关键词 ：安全疏散　防烟楼梯间 直接对外出口 气流排泄途径 矛盾性质 Discussion on antinomy property of chapter 6 and 8 in the Code for fire protection design of tall building and its solution By Liu Chaoxian★ Abstract Based on the studies of air flow model of pressurization air supply and smoke control scheme for years and the analysis on the interrelated items in chapter 6 and 8 in the code, discovers that the mathematical models and countermeasures of pressure air volume in chapter 8 are proposed under the condition of the smoke prevention staircase without evacuation exit to outside, which goes against the relevant regulation about safe evacuation in chapter 6 and lacks of the basis and theoretical support. Puts forward the flow distribution method of equivalent flow area and the fluid-network analysis method according to the characteristics of pressurization airflow in the four smoke control schemes. Keywords safe evacuation，smoke prevention staircase，exit to outside，flow escape track, antinomy property ★ China Southwest Architectural Design and Research Institute, Chengdu, China HVAC