Internet has become the hub of ideology and culture and the amplifier of public opinions. The frequent occurrence of mass incidents reflects the throes of reform and institutional shortcomings and is the results of long-term coupling and interaction of many complex factors, however, its direct cause is inseparable from the extensive information dissemination. The internet dissemination of mass incidents is the fuse to form the internet public sentiment and opinions, with the forming of internet public sentiment and opinions by more and more network information transmission of positive and negative mass events, the intensification and evolution of mass incidents result in the risk of network sentiment and opinions and form network opinions. The gathering on public topics, the formation of public opinion field, the orientation of opinion leaders, the interaction of the agenda between media and so on respectively provide the premise, the important platform, the usher and the catalyst for the transformation from network sentiment to public opinions. Facing the surging network public willing, the ruling Party must update governing ideas, adapt to internet situation, respect the free expression right of internet users, real-time guide network opinions, shape social mainstream ideology, make proper intervention with network opinions and ensure national safety of public opinions.