Research conclusions: From the research and review of the installation processes of the pipe，device and alarm system and the system linkage test of a heptafluoropropane automatic fire extinguishing system for one office building，it is concluded the steel cylinder room is the core of the system． When installing and arranging the devices in the steel cylinder room，the operation space and the passage for test and maintenance should be reserved． The main a． c power to the main fire host，linkage cabinet and multi － functional console should be fed from the special UPS dual power supply in the fire control room．