Abstract: Abstract: In order to accurately trace the development process of electrical fire and deeply investigate the cause of fire, through three typical residential fire cases, the application method of data collected by the smart meter in fire investigation was analyzed, and the rule of electrical parameter variation and electric fire occurrence was studied. The results show that the depth analysis of the data collected by smart meter can infer the timeline of operating status of electrical equipment, human activities and occurring time of electrical failure. Combined with inquiry,marks on the scene and simulation experiment, the data can trace the complete process of the occurrence and development of electrical fire and provide powerful support for electrical fire investigation.

Key words: Key words: fire investigation, electric fire, smart meter, data collected