This study tried to analyse the effect of young children's sexuality, ages, temperament and emotional intelligence upon the peer competence. The subjects were 250 children from H and W childcare center in J city. Date were analysed by multiple regression analysis with SPSS. According to this research, there are three specific results. First, a general tendency of children's temperament, emotional intelligence and peer competence is related with normal distribution. The Second indicated that the peer competence was closely associated with young children's sexuality, ages, temperament and emotional intelligence. Finally the emotional intelligence was the strongest predictor for peer competence of young children and sexuality and temperament also notable variables. Therefore, according to this research, a special education program for improvement of peer competence is strorngly desired.