The present study investigated the relation of academic achievement, family and classroom social environment, and peer interactions to prosocial and antisocial behavior of Chinese children in elementary schools. Five hypotheses were empirically tested: (1) Academic achievement is associated positively with prosocial behavior, and negatively with delinquent behavior; (2) family social environment is associated positively with prosocial behavior, and negatively with delinquent behavior; (3) classroom social environment is associated positively with prosocial behavior, and negatively with delinquent behavior; (4) prosocial behavior of children is associated positively with positive peer influence, and delinquent behavior is associated positively with negative peer influence; and (5) prosocial behavior of children is associated positively with peer's prosocial behavior, and delinquent behavior is associated positively with peer's delinquent behavior. All the hypotheses, except Hypothesis 3, were clearly supported by the data. Hypothesis 3 was only partially supported by the data.Key words: prosocial and antisocial behavior, academic achievement, family and classroom social environment, peer interactions Current research on child and adolescent behavior tends to emphasize either prosocial or antisocial behavior, but seldom are both kinds of behavior investigated in a single study (e.g., for prosocial behavior, see Eisenberg & Fabes, 1998; for antisocial and delinquent behavior, see Coie & Dodge, 1998). To fill this research gap, the present study investigated both the prosocial and antisocial behavior of Chinese children in one setting. It also explored the relation of these child social behaviors with academic achievement, family and classroom environment, and peer interactions.The prosocial and antisocial behaviors in the present study are defined based on Ma, Shek, Cheung, and Lee's (1996) study. The prosocial behavior refers to altruistic, socially acceptable or normative behavior -for examples, giving gifts to parents, helping people with disabilities to cross the road, apologizing to others after committing a misdeed, and serving as volunteer worker. The major antisocial and delinquent behavior in adolescents refers to the following: (1) general deviance such as theft, cheating on exams and coming to school late; (2) defying parents -for example, shouting at one's father or mother or going against your parents' wishes; and (3) aggressiveness, such as group fist fighting.