The network spreads quickly and has a wide range of influence. Whether it is positive or negative information, it may sweep the whole network overnight. If it is negative news, it will even cause extensive and far-reaching adverse effects. In this case, it is more and more difficult to control public opinion. How to do a good job of network public opinion? As one of the earliest professional organizations focusing on crisis management in China, key media focus on the cutting-edge theoretical research and implementation of enterprise and institutional crisis management. Mr. Li Yonggang, a senior public opinion analyst of key media, shared it from the perspective of public opinion monitoring and analysis. Li Yonggang believes that from the feedback information of public opinion service, the understanding of public opinion consultation service in enterprises and institutions is still in a relatively shallow stage. Generally speaking, enterprises' understanding of public opinion information can be divided into four levels: information management, intelligence awareness, scientific decision-making and strategic success. Generally speaking, the understanding of information by most enterprises in China only stays at the first two levels ("information management" and "intelligence awareness"), and some even don't talk about "information management". Although some enterprises have done a lot, from the perspective of information understanding, the overall level is still at a relatively low level. Specifically, public opinion monitoring's role is mainly to provide decision-making basis, collect competitors' information, evaluate the overall performance of public relations, understand the development trend of the industry, and provide crisis warning. Combined with the product and service experience of Key Point Media in online public opinion monitoring for many years, this paper talks about online public opinion monitoring from three aspects: online public opinion monitoring system, public opinion report, public opinion consultant consultation and crisis public relations training. 1. public opinion monitoring, the key media of public opinion monitoring system, adopts advanced cloud computing technology, which can monitor hundreds of thousands of Chinese and English websites at the same time, including comprehensive portal, blog platform, Weibo platform, forum community, industry portal, local site, post bar, gub and space, and has digital media mining technology to realize the whole network coverage in public opinion monitoring. At the same time, with the information intervention of professional public opinion analysts, we can quickly monitor and analyze the important information in the media such as internet, newspapers and TV news, and provide services to customers in time. Second, the public opinion report public opinion monitoring report is an objective report formed by professional public opinion analysts who, based on the data of public opinion monitoring system, use scientific network public opinion monitoring and analytical theoretical system to monitor the main carriers of online public opinion, such as traditional media network information (such as newspapers, magazines and television) and new media network information (such as forums, blogs and Weibo) around the clock. Public opinion monitoring report can be classified according to different classification methods. According to the nature, it can be divided into regular public opinion monitoring report and special public opinion monitoring report. According to time, it is divided into immediate warning report, daily information combing report, Zhou Du information judgment report and monthly public opinion analysis report. At the same time, he stressed that in addition to the regular network public opinion monitoring and analysis, key media should strengthen the research and investment in network public opinion crisis consultation and crisis public relations training. One of public opinion monitoring's functions is to create a good public opinion environment, spread a positive image and deal with negative crises. In most cases, it is not only the first time to know negative information, but also maintenance. Because the occurrence of public opinion crisis is often sudden, different industries and events present different characteristics and requirements in the process of crisis response. Key points Over the years, the Group has formed a scientific crisis response theory and a perfect response system in crisis public relations, and accumulated rich experience in crisis response, media management and information dissemination, which can provide enterprises and institutions with professional consulting services including crisis management system construction and crisis management training. You Changqiao, Chairman of Key Media, is also a well-known brand communication expert, public relations consultant and crisis management expert. He initiated the 5S principle of crisis public relations, 5B principle of public relations communication, 5c principle of news spokesman and 6C principle of crisis management system, and led the team to introduce the methods, principles and modules of establishing crisis management system, which played an important role in the communication and system management practice between the government and enterprises. Finally, Commissioner Li Yonggang suggested that two things should be done well in the network public opinion monitoring: First, we should constantly deepen and improve the network public opinion monitoring system, which is the most basic work of information acceptance and the premise of doing a good job in public opinion monitoring analysis. Second, public opinion practitioners need to be familiar with the public opinion pattern in the new media environment, understand various platforms that carry public opinion, and skillfully use them to master theoretical knowledge such as public opinion communication and crisis response. Can use scientific methods to obtain and extract valuable information, and can make reasonable early warning, judgment and public opinion construction on the basis of information.