With the popularity of computer and network among adolescent, the influences of web on adolescents aroused the attention of society and educators. Network creates another world of interpersonal interaction for adolescents. Web brought the convenience for adolescents’ interaction, but it might also lead to negative effects on the development of adolescents. Based on the conception of network interaction, the current paper explored the modes of network interaction, including instant communication, e-mail, bulletin board system (BBS), blog and social networking services (SNS). Then the features of network interaction were discussed, that is, virtuality, openness, weak ties, and equality. At last, the influences of network interaction on adolescents were analyzed, including self-expression, self-disclosure and real ego.