Abstract: With the continuous development of new media technology, information dissemination has evolved from being dominated by a single subject to being autonomously disseminated by multiple subjects, and then from a single context to a diverse and complex public opinion environment in the online environment. In this process, online communities play a catalytic role in the formation and spread of public opinion. To effectively guide the network public opinion triggered by sudden events, efforts should be made to strengthen the effective control of online communities, cultivate the media literacy of online communities, establish and improve the operation mechanism of online communities, and actively explore crisis communication strategies of network public opinion guided by the perspective of online communities, thereby creating a clear and transparent online public opinion environment.