As an increasing part of the Internet users, adolescent morality and moral behaviors on the internet deserved much attention. The present study investigated 447 adolescents’ moral performance on the Internet, Internet pro-social behaviors, and the relation between their Internet morality and pro-social behaviors online. The results indicated that (1) adolescent Internet morality was positive, and the correlation among moral cognitions, emotions and intentions was positive; (2) adolescents conducted lots of online pro-social behaviors. And adolescents reported dire online pro-social behaviors the most, followed by altruistic, emotional, anonymous, compliant, and public pro-social behaviors; (3) the frequency of altruistic pro-social behaviors in girls was significantly higher than in boys, and the public, anonymous, emotional, altruistic, and compliant pro-social behaviors reduced with the grade; (4) Internet moral cognitions and emotions could positively predict online pro-social behaviors. The results showed that the adolescent Internet morality could predict the moral behaviors on the Internet: if adolescents take more positive moral attitude, they would conduct more online pro-social behaviors.