The age of 3-6 is a critical period for human social development, and children’s peer interaction skills are the main content of development in the social field. Research on peer interaction ability in recent years has found that although teachers and parents pay more and more attention to the interaction between young children and their peers, many areas cannot yet evaluate it scientifically. Therefore, research on children’s peer interaction skills is very important and necessary. This study used the Peer Interaction Skills Questionnaire for 3-6 Year Old Children (Teacher Evaluation) (Li, 2008) to evaluate the peer interaction skills of 166 children aged 3-6 in Nanning City, Guangxi Zhuang Autonomous Region. Understand the peer interaction skills of children aged 3-6 from four dimensions: social initiative behavior, language and non-language behavior, prosocial behavior and social barriers. The current situation was investigated and the results showed that: (1) The overall development of peer interaction skills of children aged 3-6 years is positive, but there is an imbalance in development. Children aged 5-6 have better peer interaction skills than others. In particular, there were significant age differences in prosocial behavior and social barriers, (2) In terms of kindergarten types, there are significant differences between public kindergartens and private kindergartens. And in terms of social initiative behavior and social barriers, private kindergartens are better than public kindergartens.