These papers (Part1〜3) describe fire behavior in a compartment with activation of fire suppression system. At present the knowledge about it is low. Therefore we experimented by using full scale compartment with it. And we got results about vertical temperature distribution, heat release rate, heat flux and the properties of smoke and heat air current. Then we will make a reduction model of heat release rate and a calculation model of smoke and heat air current in fire time using them. If we contain offect of fire suppression system in fire safety design, building design will be free.