Abstract: In order to learn the lessons from the fires causing heavy casualties in the multi - storey buildings, stop and prevent the occurrence of malignant fire accident causing mass death and mass injury effectively, this paper applies scenarios simulation method to carry out the magnitude reconstruction of the fire happened in an animation studio in Kyoto, Japan. The quantitative calculations of fire smoke concentration field, temperature field and visibility show that the main cause of heavy casualties caused by the fire agrees well with the conclusion of the fire scene investigation. And the paper puts forward some disposal countermeasures based on the numerical analysis.

Key words: fire, numerical reconstruction, fire cause, emergency disposal