Abstract: Abstract: The thesis has taken a fire accident in a sponge factory as an example to analyze the possible cause by fire investigation and relevant material evidence identification. Mainly focusing on the suspicious objects found at the fire point, HNMR, thermal weight experiment analysis and heat release analysis has been used to verify the possibility of spontaneous combustion by polyether polyol leakage. The thesis discusses feasible path of verifying the possibility of the spontaneous combustion of residual organic liquid in the fire accident investigation of chemical companies and summarizes the deficiencies and enlightenment during the investigation process, in order to provide a reference for the accident investigation against similar fire accidents.

Key words: Key words: sponge factory fire, polyether glycol, spontaneous combustion, fire investigation