With the rapid development of the Internet, opinion leaders play a very important role in the guidance of public opinion. Gender equality, epidemic prevention measures, and Environmentalism are all global public opinion topics that have attracted much attention in recent years. In the face of these hot topics, more and more opinion leaders speak enthusiastically and express their attitudes. This study uses Key Opinion Leadership theory and secondary communication theory to explore the impact of Key Opinion Leaders on the three public opinion topics of equal rights between men and women, epidemic prevention measures, and environmental issues. More and more ordinary people pay attention to these events, which are affected by the Key Opinion Leader's attitude and make a positive response. This study made a theoretical contribution that how to promote the harmony and stability of the network environment.