This research used the fifth year (in 2001) data from "The Etiology of Adolescent's Drug Abuse: A Social Learning Model" Project. The main aim of this paper is to examine how self-concept accounts mediates the effect between parenting behavior（included monitoring and consistent discipline）and neighborhood factors（collective efficacy）and risk for delinquency. In this study, I used data from a longitudinal study of Taipei youth to address this issue. Based on the logistic regression analysis, monitoring and collective efficacy influenced delinquency both directly and indirectly through self-concept. Consistent discipline influence delinquency indirectly, not directly. Overall, this investigation demonstrated that research into delinquency should consider parenting behavior, neighborhood factors, and the mediating role of self-concept.