Abstract: In the past, peer nomination method was mainly used to measure children’s peer relationship. Each child in the class was divided into five different grades, from popular to unpopular. This research studies peer relationship from the perspective of social network, and conducts social network analysis (SNA) on the basis of peer nomination. First, the data of children’s nomination and nominees are obtained by peer nomination method, then the matrix is made by Excel, and finally the social network analysis software UCINET is introduced for analysis. This method can analyze the centrality and density of children’s peer relationship from the perspective of individual and group, and express each child’s peer relationship in the form of the graph. In this way, we can further explore the characteristics, structure and influencing factors of children’s peer relationship, and put forward feasible suggestions to promote the development of children’s peer relationship.