本文采用社会网络分析方法(SNA),以中国公众使用新媒体参与公共议程为实证研究对象,以柴静《穹顶之下》纪录片事件为例,运用ucinet软件生成了微博舆情信息传播网络拓扑图,来分析网络参与中微博舆情传播的中心性、网络结构特征以及关键节点识别,以期研究微博舆情传播的点度中心性、中间中心性和接近中心性、网络结构、节点 This paper uses the social network analysis method (SNA) to take the Chinese public’s participation in the public agenda as an empirical research object. Taking the example of the documentary “Under the Dome” by Chai Jing, this paper uses ucinet software to generate the topological map of microblogging public opinion information dissemination network To analyze the centrality, network structure and key node identification of the micro-blog public opinion communication in the network participation, with a view to study the dot-center, the middle and the near-center, the network structure, the nodes