Abstract: With the advent of the internet plus era, social network has been given new functions and meanings, in which the key nodes occupy a crucial position in the topology, and bear significant functions in the social network. With the increase of data scale in social network, the holding data in the key nodes contains a great value, standing on the mining of key nodes and playing an oriented role of key nodes in social network which can help us to understand the operating mechanism and regularity of social network, further govern social network with innovativeness, and serve our economic society effectively.

Key words: social network, key nodes, topology, information propagation, topic model

摘要： 互联网+时代的到来，社会网络被赋予了全新的内涵与功能，其中关键节点在拓扑结构中占据了重要的位置，在社会网络中承载着重要的功能.随着社会网络中数据规模的不断增加，关键节点的承载数据蕴含了重要的价值，立足对关键节点的挖掘，发挥关键节点在社会网络中的导向作用，有利于了解社会网络的运行机理与规律，进一步创新社会网络治理方式，使之更好地服务于我国的经济社会.

关键词: 社会网络, 关键节点, 拓扑结构, 信息传播, 主题模型