This study aimed to examine the influences of children"s sex and the social information interpretation(intentional/incidental) on aggressions (form/function). The subjects were 363 fifth and sixth graders from 6 elementary schools in Busan and the data were analyzed with two-way ANOVA. The research findings were as follows: First, children"s sex had significant influence upon their overt aggression, and children"s interpretation of social information had significant influences upon their overt aggression and relational aggression alike. Second, children"s sex and interpretation of social information had significant influences upon their proactive aggression and reactive aggression. Finally, children"s sex had significant influences upon proactive-overt aggression, reactive-overt aggression and proactive-relational aggression.