The purpose of this current study was to investigate the relationship between verbal communication skill levels among 4-year old children and their social interactions with peers in the play-group. Nineteen 4-year old children (9 boys and 10 girls) were observed to determine verbal communication skill levels in free play situation in kindergarten. The collected data showed that the amount of utterances differ greatly in individuals. However, in general, girls showed more affirmative utterances than boys, on the contrary, negative verbal expressions tended to be let out from boys more than girls. Three low-skill level( LSL) and three high-skill level( HSL) children were sorted out from the subjects to compare their social behaviors. The results showed that LSL children spent more time alone, displayed higher activity level and attempted to join play-groups, but their attempts did not seem to go on smoothly, because they received many rejections and were ignored by group members. On the other hand, HSL children were rather group oriented, and when they leave certain play-group, they were followed by playmate(s). In addition, despite the fact that HSL children expressed a lot of demand/indication/offering speeches toward other group members, the members affirmatively accepted them. This result suggests that HSL children seemed to enjoy popularity among class members.