文章引入虚拟社区信息交流网络,在对该网络的描述与分析中又引入了近年来国外发展很快的加权小世界理论,探讨用社区成员的特征关系长度和聚类系数来表征实践社区的信息扩散频率、集中度问题的合理性,认为信息交流频率和集中度应该保持为小世界的形态,为在全局和局部范围内创建良好灾害应急信息沟通机制,并进一步研究虚拟社区灾害信息沟通与交流方式提供了理论指导。 This paper introduces virtual community information exchange network, introduces the theory of weighted small world which developed rapidly in recent years in the description and analysis of the network, and explores the characteristic community length and clustering coefficient of community members to represent the information of practice community Diffusion frequency and concentration degree. It is believed that the frequency and concentration of information exchange should be kept in the shape of a small world, to create a mechanism for communication of good disaster emergency information both at global and local levels, and to further study the communication and exchange of disaster information in virtual communities Way to provide theoretical guidance.