The report of the 17th national congress of Communist Party of China points out，a fundamental direction on democratic politics of China is to expand citizen’s orderly political participation and develop grassroots democracy.But with developing the network, the question of the public opinion on the internet is getting more and more serious.Traditional management is invalid to the public opinion of the network，so it makes the management of public opinion in the network close to the vacuum.Therefore in view of the existing network forum as the main dissemination position, the existing methods of social network analysis (SNA) are utilized to analyze subject and object in the public opinion, bring most subjects into the management, and follow the propagating information in time and effectively, in order to achieve really effective management.