【Purpose/significance】 The decline of short-video public opinion on public emergencies is influenced by multiple factors.

Identifying the elements that play a key role in influencing the decline of short video public opinion in public emergencies helps rel⁃

evant subjects improve the efficiency of analyzing the process of the decline of short video public opinion in public emergencies, so

that they can quickly and accurately grasp the evolution process of the short video public opinion decline in public emergencies with less input.【Method/process】 This paper adopted the meta-ethnography method to collect, translate and integrate the original studies related to the decline of public opinion on short videos of public emergencies, to obtain the set of influencing elements. Further, this paper adopted the fuzzy set theory-DEMATEL method to identify the elements that have a key influence on the decline of short-video public opinion on public emergencies by calculating and ranking the cause degree, center degree, influence degree and influenced de⁃gree of each influencing element. Finally, according to the identified key influencing elements, targeted strategies to guide the decline of public opinion in short video of public emergencies were proposed.【

Result/conclusion】 The results of the study show that the set of influencing elements of short-video public opinion decline of public emergencies contains a total of 17 influencing elements, and 8 key influencing elements are identified from them.【Innovation/limitation】 The research on the strength of the key influencing ele⁃ments affecting the decline of short video public opinion in public emergencies needs to be further in-depth.