The purposes of this study were to construct the peer acceptance program for unpopular young children and to investigate the effects of developmental program on the peer relational knowledges, attitudes, skills. The subjects of this study were selected Fifteen unpopular young children whose peer's popularity scores were within the lowest 30%. The storytelling, role-play, peer-modeling, cooperative activity, reinforcement activities to develop the peer relational competences of unpopular young children were tried with three group for 12 weeks. The results of this study were as follows. First, peer acceptance program had a positive effect on the improvement of unpopular young children's peer relational knowledges, attitudes, skills. Second, peer acceptance program improved unpopular young children's peer popularity.