Abstract: The research progress of combustion improver trace on the arson fire scene is overviewed. The combustion trace of common liquid combustion improver on combustible material and incombustible material is summarized. The factors affecting the liquid combustion improver are analyzed, including the self-characteristics of the liquid, the carrier properties and other factors. The disturbing trace similar to the combustion improver trace are discussed, such as flashover, melting or falling objects. Disadvantage of the study is analyzed, and prospects are put forward. 

Key words:  combustion improver, fire patterns, influencing factors, interference patterns