본 연구에서는 유아의 우정 형성을 증진시키는 활동이 유아의 친구관계 개념과 자기조절 능력에 어떠한 영향을 미치는지 알아보고자 하였다. 연구대상은 G시에 소재한 S유치원과 E유치원의 만 5세 유아 40명으로 실험집단과 통제집단에 각각 20명씩 선정하였다. 선행연구 및 문헌을 탐색하여 유아의 우정관련 요소를 신뢰감 형성, 협동, 친사회적 태도 및 행동, 호의와 친절, 배려와 존중의 5가지로 추출하였고 이를 고려하여 우정증진 활동을 구성하였다. 연구결과, 우정증진 활동은 유아의 친구관계 개념과 자기조절 능력을 유의미하게 증진시켰다. 이에 유아로 하여금 우정증진 활동에 보다 적극적으로 참여하여 유아가 친구를 존중하고 친구와의 관계 안에서 자신의 감정이나 행동을 조절해 나가는 능력을 향상시킬 수 있도록 하기 위한 현장의 시사점을 논하였다.This study was to examine the effects of friendship supportive activity on young children's conception of peer relationship and self-regulation ability. The subjects were 40 five-year-old young children in the S kindergarten(experimental group) and E kindergarten(control group) located in G city. The experimental group was carried out the friendship supportive activity. The factors of this program were confidence construction, cooperative works, prosocial attitudes and behaviors, goodwill and kindness, and concern and consideration. The control group was carried out the general activity which did the kindergarten. Data from the results of pre and post test were analyzed with t-test using SPSS 14.0 program. Consequently, this activity promoted relationship with peers and changed formation of conception of peer relationship by improving qualitative interaction. It also improved ability to control young children's emotions or behaviors by respecting friends. Thus, close interaction with peers in natural situations should be stimulated to improve young children's conception of peer relationship and self-regulation ability. Moreover, it is necessary to be recommended to make reliability with friends by doing activities to develop prosocial behaviors, considerations and respect.