The statistical population of the research is consisted of all of the students of the Islamic Azad University of Mashhad who are studying (not graduated). Using the simple random sampling based on two categories of the boys and the girls and according to Cochran formula, 378 numbers of people were at hand as the adequate sample. For the data being more valid, 400 students (200 girls and 200 boys) were questioned and interviewed. After analyzing the data by SPSS, these results were achieved: there was a significant relationship between the amount of using the Internet and the sex, age, educational degrâee, and the amount of parentsâ agreement of the students however, there was not a significant relationship between the amount of using the Internet and the economic and social level of the person and the amount of fear and anxiety of the person of making contact in the real world. On the other hand, there was a significant relationship between the amount of using the Internet and the amount of the Internet dependency (addiction), the amount of anger and aggression, the amount of isolation and solitariness, the amount of depression and fatigue, decreasing of social relations with family and friends, and increasing of the information and intelligence of the students in scientific-social fields and in doing the daily routines. There was also a significant relationship between the sex and the amount of the Internet dependency (addiction), the amount of hiding the personâs sex in the Internet, the amount of trust to people in the Internet, the amount of making contact with the opposite sexes friend, the amount of using the weblogs, economic and social information, political information, sports information, pornography, the music, and the software. On the contrary, there was not a significant relationship between the sex and the satisfaction of having a hidden identity, the amount of using emails, chat, games, movies, jokes, postal cards, and using the Internet scientifically, educationally, culturally, and artistically.