Basing on the theory of social cognition and the questionnaire survey data （N=1538） of 7 areas in China，this paper firstly analyzes the current situation of cyberbullying among adolescents in China，and probes into the individual and social reasons of bullying behavior and bullied behavior among adolescents on the Internet. The results show that teenagers are bullied more than others on the Internet. And the older the teenagers are，the more likely they are to bully others online. Compared with men，women are less likely to have cyberbullying and to be bullied. The better performance results of the teenagers，the less likely they are to be bullied online. In terms of media use，teenagers who spend more time online are more likely to bully others online. And the more information leaked，the more likely teenagers are to bully others and be bullied online. However，this researther did not find a significant impact of school and parents’ restrictions on online behavior on cyberbullying and bullied behavior，indicating that there is no point in blindly restricting online behavior，thus other social factors should be considered to reduce the occurrence of cyberbullying.