Abstract: Objective To explore the effect of group psychological intervention in adolescents on internet addiction. Methods A total of 51 internet addictive adolescents, aged between 14 and 25, were treated in Addiction Medicine Center of General Hospital, Beijing Military Command, Chinese People's Liberation Army from March 1st to July 31st, 2008. The experimental group was made up of 28 adolescents who volunteered to participate in an added group psychological intervention and the control group was composed of 23 adolescents who refused to receive the intervention. The experimental group received intervention at least 6 times. At the time of pre-intervention, post-intervention, 1 month and 3 months after intervention, both groups were investigated with questionnaires of Davis' Online Cognition Scale(OCS), Family Assessment Device(FAD), Perceived Social Support Scale(PSSS) and Mach Scale IV version 1. Results 1) In experimental group, there are significant inter-subject differences in the score of OCS total, Social comfort, Loneliness/depression, Diminished impulse control, Distraction, FAD's sub-scale Communication, Roles, Affective Responsiveness, General Functioning, PSSS and Mach Scale Ⅳ version. Meanwhile, significant differences were found between pre-intervention and post-intervention(including all the three post-survey mentioned above); 2) In control group, there were significant inter-subject differences in the score of OCS total, Social comfort, Loneliness/depression, Diminished impulse control and Distraction. Meanwhile, significant differences are found between pre-intervention and post-intervention(including all the three post-survey mentioned above); 3) There were significant differences between two groups in the score of OCS total, Social comfort, FAD's sub-scale Roles, General Functioning and PSSS 3 months after intervention. Conclusion Group psychological intervention can significantly relieve the symptoms of internet addiction, strengthen the social comfort, and improve FAD's roles, general functioning, and PSSS situations.

Key words: internet addiction, adolescents, group psychological intervention, family functioning