HFC-227ea fire extinguishing system is widely used in China and many other countries and regions in the world at present. Propane heptafluride is a kind of colorless and odorless gas, with zero consumption potential to the ozonosphere, which is in compliance to the requirement of environmental protection. It is an ideal substitute for alkyl halide extignuishant at present, with the characteristics of clean, low toxic, good electric isolation and high fire extinguishing efficiency.