【目的/意義】探索突發事件輿情傳播網絡的拓撲結構和傳播規律、識別與評判突發事件輿情傳播網絡中重要節點,有助于從源頭上控制輿情,增強政府管理突發事件網絡輿情的能力。【方法/過程】以"魏則西事件"為研究對象、采集并整理數據,運用社會網絡分析法,結合生命周期理論,闡述了該事件輿情擴散過程,繪制了"魏則西事件"輿情傳播網絡社群圖,并以定量方式對"魏則西事件"輿情傳播網絡進行了結構測度分析。【結果/結論】拓展了SNA的應用,發現該事件輿情四個階段傳播規律,識別、總結該輿情傳播網絡中關鍵節點結構特征,并提出針對突發事件輿情傳播網絡本身拓撲結構的控制建議,最后,提出政府應對突發事件網絡輿情傳播的階段管理建議。

【Purpose/significance】In order to control the source of online public opinion for emergencies and enhance gov-ernment’s ability of administrating it, exploring its topological structure, propagation and identifying its key nodes are neces-sary.【Method/process】This paper collects data and uses social network analysis(SNA)method to study the case of Wei Zexi.Combining with life cycle theory, the article describes public opinion spread process, and draws "Wei Zexi incident" onlinepublic opinion dissemination community map. Then, this paper analyzes the structure of "Wei Zexi incident" public opin-ion spread network in a quantitative way.【Result/conclusion】The paper expands the application of SNA and finds the fourstages’ propagation law about online public opinion dissemination in emergency. Then, the paper identifies of key nodesand summarizes the structural characteristics in the public opinion dissemination network. The paper summarizes and putsforward the control recommendations for its topology structure. Finally, government’s stage management suggestions whichare about online public opinion spread during emergencies are put forward.