"Many new and important developmental issues are encountered during adolescence, which is also a time when SNS(social network service) becomes increasingly popular. The research attempts to examine the effect of online relational maintenance, offline relational maintenance and their interaction effect on adolescents’ well-being. Six hundred and fifty-six high school students completed an questionnaire about the activities on social networking sites, online/offline relational maintenance strategies and their well-being. Results reveal that adolescents’offline relational maintenance was positively associated with well-being. The offline relational maintenance moderated the relation between the online relational maintenance and adolescents’ well-being. These findings imply the offline relationship is fundamental factor to understand the influence of online relationship on well-being. Finally, the implications of these findings and directions for future study were discussed."