This study was to investigate the difference of young children's peer interaction according to individual backgrounds; and the effects of temperament and parenting styles on young children's peer interaction. Data of temperaments, parenting styles, and peer interaction from the total of 1,754 young children among participants of 2011 Panel Study on Korean Children was re-analyzed. Results indicated that, in terms of the factors of individual background, girls showed relatively higher peer interaction scores than boys, and boys displayed higher scores in play disruption and play disconnection. In terms of birth order, it appeared that second child more disrupts peers than first child does. Second, as to the effect of temperaments and parenting styles on peer interaction; social and controlling parenting behavior of the mother, emotionality of temperament, and social parenting behavior of the father were positively related to peer interaction and their effect size was 15%. Social parenting behavior of the mother and father had a negative relationship with peer disruption. Sociability and emotionality of temperament were positively related to peer disruption and their effect size were 10%. With respect to peer disconnection, it was negatively related with social parenting behavior of the mother and father, and positively with young children's emotionality and activity with both effect sizes of 30%. With the results given, implications and recommendations were discussed.