Communication room, data center is developing with the informationize and the popularity of information system, and the workplace is usually colorless, odorless, non-electrical conductive, and equipped with electrified objects and precise instruments. The firefighting system is indispensable for these data centers, and water spraying system can not be used for the devices in data center, because it will damage the computer equipment and other precise instruments. So except setting automatic alarm system, gas suppression system should be chose to reduce the damage.