The purpose of this study was to examine the effect of family conflict and personality characteristics on adolescents' internalizing and externalizing adjustment. Also, this research was to investigate how family conflict and personality characteristics predict adolescents' internalizing and externalizing adjustment according to the adolescents' sex and age. The results were as follows : First, there were statistically significant differences in family conflict according to socio-demographic characteristics. Adolescents having mothers with a job perceived more covert conflict between parents and conflict between fathers. In
addition, adolescents those who had a good school record perceived less parent-adolescent conflict. Moreover, those who lived with one-parent and had low socio-economic status reported high scores of covert conflict between parents. Second, there were not statistically significant differences in family conflict according to sex of adolescents. However, there were statistically significant differences parents' covert conflict, conflicts between parents and adolescents according to age of adolescents. High school students had more perception of their parents' covert conflict and conflicts between parents and adolescents than middle school students. Third, there was a statistically significant differences in social responsiveness according to sex of adolescents. Girls felt more social responsiveness than boys. Also, there was statistically significant differences in intimacy and social responsiveness according to age. High school students reported high scores of intimacy and social responsiveness compared with middle school students. Fourth, adolescents' internalizing maladjustment was higher when they were older, perceived conflicts between mother and themselves, perceived conflicts between brothers and sisters, had more extroversive characteristic. Fifth, adolescents' externalizing maladjustment was higher when they were boys and older, perceived conflicts between mother and themselves, perceived conflicts between brothers and sisters, had more intimate and extroversive characteristic, had less social responsive characteristic.