The purpose of this study develops the forgiveness program which focuses on the peer relationship of elementary school children, verifies the effectiveness of a devised forgiveness program and then identifies the results of this research. From a research point of view, the forgiveness program was amended with conducting the further preliminary forgiveness instruction program. The Enright's scale of forgiveness was surveyed to all 668 students from 3 elementary schools, located in J city, so that it could chose specific children with low forgiveness. Before the program commenced, it was explained to the parents and children what the purpose and procedure of this research would be and then the forgiveness program conduct only on the 12children whose parents consented and who hoped to be participants themselves. This research specification composed of two-factor mixed designs (2)(treatment group, untreated control group)× (3)(testing period: before, after and continuing)- checked up the relationship of children before and after the forgiveness program, and to the 4 weeks after the program completely finished. The statistics of data was used to analyse through SPSS windows program and Kwakstat(Kwak ho wan, 1993) The forgiveness program was composed of 3steps- introduction, development, completion etc. - and total 6 sessions. Each session progressed with forms of motive induction, goal presentation, lecture, group counseling activation, sharing their experience and impression, presenting the subject, session evaluation, sharing feedback and so on. In accordance to the result of this study, devised forgiveness instruction program increased the forgiveness level of emotion, cognition, behavior, the total forgiveness level which are components of forgiveness and meaningfully the ability of relation of children. Furthermore, the effect was founded to last for 4 weeks after the program. This program was constituted to enable to adapt forgiveness as one way to prevent diverse predictably negative connection and relational trouble frequently able to be generated in peer group. In addition, it is thought to be significant in that confirming the forgiveness was able to increase through educational intervention.