对基于社区结构的P2P流媒体系统进行了建模研究,总结提出了k-n模型和k-n-t模型两种社区结构模型,并对这两种模型的小世界网络特征作了理论分析和比较。结果表明,k-n模型社区结构比k-n-t模型具有较高的聚集系数,而k-n-t模型社区结构在聚集系数和平均路长两方面取得了更好的折衷。 The community structure-based P2P streaming media system is modeled and the two community structure models of k-n model and k-n-t model are summarized. The characteristics of the small-world networks of the two models are analyzed and compared. The results show that the community structure of k-n model has a higher aggregation coefficient than that of k-n-t model, while the community structure of k-n-t model achieves a better compromise between the aggregation coefficient and average path length.