Abstract: The article introduces the investigation and determination of a residential arson case. Through on-site inspection, visits and inquiries, video analysis, physical evidence identification, and corpse examination, the development and spread characteristics of the fire were analyzed, the ignition location, ignition point, and ignition time were accurately identified. At the same time, in terms of analyzing and determining the characteristics, nature, and causes of the fire, the public security organizations closely cooperated with the fire rescue agencies and fire rescue agencies played a leading role in fire investigation. At the same time, numerical simulations were conducted on fire scenarios to study the temperature field and smoke diffusion laws in fire scenarios, verifying the fire process and the cause of death, and improving the level of fire investigation.

Key words: residential housing, arson case, fire investigation, residential fire