[Purpose/Significance] This paper introduces the elements of crisis management to study the theme evolution law of network public opinion of emergencies, so as to provide new ideas for accurate network public opinion disposal and dynamic decision-making of emergencies. [Method/Process] Taking the factual text data of specific emergencies as the source, using the implicit Dirichlet distribution theme model to build a dynamic theme evolution model, this study mined the stage division and topics in social media emergencies, and summarized the constituent elements of public opinion crisis. [Result/Conclusion] Based on PPRR and 4R crisis management theory, the development of public opinion is divided into just-unfolding stage, outbreak stage, fluctuation stage and quiet stage, and the work tasks are divided into four categories of readiness, responsiveness, reduction and resilience. Finally, the governance model of network public opinion is proposed.
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