The growth and accumulation of knowledge is the internal power of the development of the discipline. And the increase in knowledge is influenced by social structure within the scientific community. In order to explore the social structure in postgraduate education research community,this paper adopts the social network analysis method based on the co - cited data of the authors,and u- ses the UCINET software to draw the social relation network in the community of postgraduate education in our country. It is found that the citation network structure of postgraduate education research is relatively loose,with the existence of“main group phenomenon” and“island phenomenon”. There are 7 academic groups derived from the scholar group in postgraduate education research. According to their positions in the network structure,these 7 academic groups can be divided into four types: knowledge output academic group, knowledge input academic group,knowledge comprehensive academic group and knowledge island academic group.