Abstract：[Purpose/significance] In this paper, based on the frequent occurrence of COVID-19 pneumonia in older adults who do not cooperate with epidemic prevention, we study the characteristics of older adults' information perception and protective action decision-making during public health emergencies. Discuss the relevant influencing factors of older adults as stakeholders when making protective action decisions in emergency information management of public health emergencies, to provide some help for the overall improvement of the future elderly information supply system. [Method/process] The article adopts the empirical analysis method and uses web crawler technology to grab 772 epidemic related articles from WeChat public account platform. At the same time, based on a questionnaire survey, the project obtained the information perception of 660 older adults during the epidemic. Based on keyword extraction and social network analysis, this project used the network text mining method analyzes data. This paper combines protective action decision-making models with the elderly health information and healthy behavior theory, based on the evolution of protective actions of the elderly in different life cycles of public health emergencies, and analyzes the characteristics of the elderly's information perception and protective action decision.[Result/conclusion] The results of the study found that: in public health emergencies, firstly, the content of early warning information is a key factor influencing elderly risk perception and protective action decisions; secondly, in different life cycle stages, elderly risk perception is prone to large fluctuations; Finally, when making protective action decisions, the elderly are more likely to make emotionally irrational behaviors due to interest-related issues.