In the experiments the temperature did not decrease quickly at the initial stages but jumped up and down with water mist applied. When the fire was extinguished, the temperature of cooking oil decreased to 220 °C. The temperature jump was not obvious at the initial stages of applying water mist. The results given in Figs. 5-10 show that the water mist envelope and coverage play important roles in extinguishing the pool fires. Although there were some temperature increase during the initial period of mist introduction, however in general the fires can be extinguish in a relatively short period of time. In addition, according to the literature the spray characteristics of individual nozzle, as well as multi nozzle arrangements, which are represented by spray coverage area, fluxs of water mist, and spray momentum are also important factors for extinguishing cooking oil fires [1-4,10].