Abstract: Internet addiction is a type of psychological dependence on internet use, and there are a lot of similarities and differences between it and traditional addictions. So far only a few measurements was developed so well that the reliabilities haven’t ever been criticized by many researchers. In the same time, in most of the cases, the researchers have studied the phenomenon by the only way of survey, while few of them have designed any strict experiments to study it . However some of the researchers have brought about several models to interpret the phenomenon, such as, Young with the ACE Model, Davis with the Cognitive-Behavioral Model and Grohol with the Stage Mode, who have done some good jobs in the exploration of the relationships between internet addiction and the addictive features of internet itself, the personality traits of the internet users and the surroundings around them.

Key words: internet addiction, internet addiction disorder, pathological internet use