The rapid outbreak of COVID-19 has aroused a wide range of social concerns, which has brought great challenges to the analysis of online public opinions. To solve this problem, this paper uses the web crawler technology to collect the data of the information comments on COVID-19 published by the official media, and arranges the collected comments in chronological order. First, TF-IDF is used to extract the key feature words of the text, then OLDA model is used to analyze the evolution of the subject words in chronological order, and then a vector model of comment set words is constructed.Then K-means is used to cluster the topics, and the clustering results are analyzed by part of speech tagging. Experiments show that this method can get the information in the comments changing with time, and can detect the information that needs to be concerned.
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