Abstract: To discover the cause of Interact addiction disorder and find out the effective way to correct it．the fol— lowing methods are used：using the questionnaire about network usage to select the teenager’s student who has srievous interact addiction disorder，and calculating the proportion of them．By measuring the characteristics of those students in the mental health and comparing with the other by the Symptom Check List 90 and MHT，we draw the conclusion that intemet addiction disorder will result in negative influence to the teenager’8 student on learning，body，human relations， social intercourse and mental health．