Heptfluoride propane fire extinguishing system is one of the commonly used fire safety measures in subway project. In this paper, the fire-fighting mechanism of heptfluoride propane fire extinguishing system is analyzed, its design and application in subway project are described according to the design code and the real subway applications. Then the main design process is summarized briefly,the countermeasures on how to understand the design code properly and solve the common design problems are discussed. At the same time, the experience and suggestions on how to make design more economical and reasonable are brought forward.%七氟丙烷气体灭火系统是地铁工程常用的消防设施之一.分析了七氟丙烷气体灭火系统的灭火机理,结合规范和地铁工程实例,阐述了七氟丙烷气体灭火系统在地铁工程设计中的应用情况,对主要设计过程进行了扼要的梳理,对如何深入理解规范条文以及如何解决一些常见设计难题,提出了应对策略,并对如何使设计做到经济合理提出了相应的建议.
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