Abstract: With its popularization and development in China, due to its fastness, convenience, independence and autonomy, internet has become Chinese citizens'main public areas for obtaining information, social interaction and social participation. Based on the analysis of the theory of collective action, this paper studies its applicability and implications for collective action in the internet. Internet users'attitudes and opinions concerning Diaoyu Island Incident were surveyed randomly; the access to information of "opinion leaders" of different network communities through "weak ties" was studied; Internet users in the network of the "opinion leaders" build a network of "consensus" through strong ties and form the an online public sphere, sharing sentiments, and in this way online interactions are strengthened, while opinions are assimilated, leading to the formation of explosive online movements. On this basis, this paper analyzes the structural characteristics of network movement, and puts forward countermeasures and suggestions to guide network movement from the perspectives of government control, network organization and the users.