The relation of service learning, moral development status and social caring in adolescence was investigated in this study. Two questions were assessed in this study: 1. What factors will affect adolescents' moral development status within a time span of service learning? 2. What's the relation between adolescents' perception in social caring (including empathy, responsible citizenry, and action generated from a foundation of justice) and their family background? 3. What's the relation between adolescents' self-perception in ability of social caring and family background? Participants were 200 college freshmen who participate in community service during a whole year. Change scores in moral judgment were measured through pre and post surveys of the study. Hours of participating service learning were also investigated. Results indicated: 1. There was a significant relation between the change of moral development status and participants' family relationship. 2. Adolescents' perception of social caring was affected by family relationship, family encouragement and self past experience in social service work. 3. Adolescents' self-perception in ability of social caring was affected by family relationship, family encouragement, self and parent's past experience in social service work.