Our original research is dedicated to the analysis of factors of preventing Internet-addiction of teenagers. We have allocated main directions and approaches to studying psychological peculiarities of Internet-addiction in the world and Ukrainian science. It discloses correlation of the essence of Internet-addictiveness and Internet-addictive behavior (IAB), outlines main criteria and factors which impact its formation (psychological, social-psychological, and social). We have researched the problem of psychological peculiarities of the display of teenagers’ Internet-addictive behavior in the age aspect, namely in the adolescent age, as a crucial period of generating IAB.

It is proved that intensity of demonstration of Internet-addictive behaviour (IAB) depends on individual-psychological (individual peculiarities of adolescent age) and micro social (psychological difficulties and complications generated by the close social environment) factors, which don't appear separately from each other, but perform in interconnections and interdependence. Outlined are main types of teenagers' behavior in the Internet, comprising: obsessive-searching type, compensatory type, emotion-dependent type, communicative type, cyber-sexual type.

Psychological conditions and directions of effective preventing of generation of Internet-addiction in adolescence age are defined in the paper. Results of the experiment proved expediency and effectiveness of the our programme of preventing Internet-addictive behavior of teenagers.