Public opinion analysis is a process of deep-seated thinking processing, analysis and research on public opinion according to the needs of a specific problem and drawing relevant conclusions. Content analysis is a special method for objective and systematic quantitative analysis of information content, and its purpose is to discover or test the essential facts and trends in information. The implicit information content contained in the prompt information, the intelligence prediction of things' development and the analysis of public opinion should make clear the stage of the event or topic itself, which is generally divided into different stages, such as initiation period, brewing period, occurrence period, development period, climax period, processing period, calm period and feedback period. Secondly, we should scientifically define a hot spot of public opinion and then analyze it. Hot events are generally divided into sudden natural disasters, production safety accidents, mass incidents, public health incidents, public power images, judicial incidents, economic and people's livelihood incidents, social ideological trends, emergencies involving China and other countries. In view of the influence of public opinion, the attention of people's interests and the degree of damage to the image of the public sector, the parameter setting and data analysis framework of public opinion analysis should pay attention to the following situations: the general situation and context of the event development, what are the main views and emotions of the people, and whether the people are in the stage of cognition, attitude expression or action; Arouse people's awareness of social movements and even the degree of social unrest from cognition; Degree of organization and action plan; Carefully use a politicized interpretation to analyze whether there is a clear interest appeal; Whether it has a huge impact on the existing social system; How likely it is to be supported or used by anti-China forces; Whether the action goal is clear, which departments or even existing systems are specifically pointed to; Public opinion analysis researchers should be "non-participating observers" and avoid becoming "non-observing participants", and be both neutral and keen.