Abstract: During the period of social transformation, social contradictions have become prominent, and emergencies have occurred frequently. The online public opinion that uses media as the main medium of communication has become the focus of the party and the government. With the help of Sina Weibo's "Micro- indicator" data analysis tool, and from the perspective of the life cycle, the evolution of Internet public opinion in the "Wei Zexi Incident" and "Leiyang Incident" is explored in this paper, and we also summarize the government's response to public opinion, and propose that the government should guide public opinion respectively in
the "latent period", "outbreak period", "duration period" and "declining period".

Key words: online public opinion, guidance of opinion, life cycle, Wei Zexi Incident, Lei Yang Incident