The purpose of this study was to examine the effects of parenting behavior, peer attachment, teacher relationship on adolescent's self-regulated learning. Participants are 2,351 of Korean children and youth panel study(KCYPS) middle school studying from 2010. Secondary questionnaire data on parenting behavior, peer attachment, teacher relationship and self-regulated learning are used for this study. The data were analyzed using pearson's correlation analysis and multiple regression analysis. The results were as follows: First, parenting behavior, peer attachment, teacher relationship were significantly related to adolescent's self-regulated learning. Second, the most influential factor of self-regulated learning was teacher relationship. Parent's monitoring, affection, reasoning overall influenced to the self-regulation learning positively. Also, peer attachment affect the self-regulated learning positively.