This study investigated the relationships between exective function and self-regulation function, social skills in young children. Participants were 105 children (4-6 years old), 60 of whom were boys and 45 were girls. The investigator told a story and asked each children to answer with how to action in those situations. As a result, the assertion skill was affected by inhibition control and the working memory in a boy and was affected by the cognitive flexibility in a girl. The cooperation skill was affected by self-assertion and the self-inhibition in a boy and was affected by a working memory and the self-inhibition in a girl. The self-control-skill was affected by inhibition control and the self-inhibition in the boys, and was affected by a working memory and the self-inhibition in the girl. These results suggest that the relationship between self-regulation and social skills in children.