[Purpose/significance] The research aims to quantitatively measure the information disclosure level of mul?
tiple subjects in public health emergencies and reveal the status of information disclosure during epidemics in China
from the data level. It provided a new analytical framework for the research on the information disclosure behavior of
multiple subjects and provided theoretical support for the government and other related entities to improve information
services. [Method/process] The article took the microblogs related to the epidemic disclosed by each subject as the re?
search object. It constructed an analysis model for the evolution of information disclosure contents and characteristics
of multiple subjects. Then, we used the TFIDF-LDA model to extract topics and measured the breadth and depth of in?
formation disclosure based on the theor y of social penetration. Finally, we analyzed the characteristics of information
disclosure content based on the life cycle theory and explored the information disclosure model and evolution trend of
multiple subjects. [Result/conclusion] The information disclosure content of multiple subjects during the epidemic was
on a wide range of topics, and there were significant differences in the content and characteristics of different subjects'
disclosure. The government's disclosure was positive and of the highest quality. It aimed at positively guiding public
opinion. Mainstream media had a wide range and depth of information disclosure and were highly sensitive to data priva?
cy. Self-media had a distinctive and focused disclosure theme and mainly undertook scientific communication tasks.