Abstract: Experimental studies were conducted to investigate the interaction of water mist with flames of ethanol fuels soaked in porous beds. Effects of the nozzle jet pressure, the fire preburn time and the characteristics of porous materials on the water mist extinguishing were conducted and discussed. The experimental results show that for the same preburn time, the larger the nozzle jet pressure is, the faster the temperature in both the flame zone and porous beds changes and thus the shorter the fire extinguishing time is. While under the same nozzle jet pressure condition, the longer the preburn time is, the shorter the fire extinguishing time is. Furthermore, effects of the characteristics of porous materials on fire extinguishment by water mist were also discussed in this paper. Experimental studies were conducted to investigate the interaction of water mist with flames of ethanol fuels soaked in porous beds. Effects of the nozzle jet pressure, the fire preburn time and the characteristics of porous materials on the water mist extinguishing were conducted and discussed. The experimental results show that for the same preburn time, the larger the nozzle jet pressure is, the faster the temperature in both the flame zone and porous beds changes and thus the shorter the fire extinguishing time is. While under the same nozzle jet pressure condition, the longer the preburn time is, the shorter the fire extinguishing time is. Furthermore, effects of the characteristics of porous materials on fire extinguishment by water mist were also discussed in this paper.