Abstract: Smoked food is very common in our daily life,and it is very popular with consumers. With the change of people's life concept and lifestyle,people's requirements for smoked food are not only limited to flavor,but also more inclined to its safety. Due to the limitation of processing technology,the flavor and safety of traditional smoked food are not as good as that of modern liquid smoked food. Therefore,in order to let people know more about the fumigation liquid and its products,this paper summarizes the research status and application of the fumigation liquid at home and abroad,introduces the main components of the fumigation liquid,and makes a comparison between the traditional fumigation and the liquid fumigation. On this basis,the paper expounds the unsafe factors of benzopyrene in the fumigation liquid,in order to provide references for future researchers.