The purpose of this study was to examine the effects of personal factors(gender, aggression, social immature) and environmental factors(maternal psychological control, peer social support) on bullying among early adolescents. A total of 252 youths(11-14 years of age) and their parents were recruited from elementary and middle schools. Results indicate that bullying victimization can be predicted from maternal psychological control, gender, social immature, and peer social support. Bullying perpetration can be predicted from gender, aggression, and maternal psychological control.