PURPOSE: The main purpose of this survey is to identify the factors affecting cyber security of students. In this paper, based on theoretical school of Copenhagen, theoretically Coleman, the study of social trust and felling of cyber security will be discussed. METHODS: This research was used survey in 2015 to assess the students' felling of cyber security PAYAME NOOR UNIVERSITY of Najaf Abad. The research instrument was the questionnaire. Students of PAYAME NOOR UNIVERSITY branch of Najaf Abad with a 7000 population were the statistical population of this study. Based on sample volume formula, the sample size of 300 students were selected from PAYAME NOOR UNIVERSITY center of Najaf Abad. Method of sampling is combination of cluster, simple and class random. RESULTS: the results of the study showed that there is a significant difference between men and women in cyber security felling. There was a significant difference between individual characteristics and cyber security. Feature of the individual, age, sex, marital individuals. CONCLUSIONS: Multiple regression analysis showed that among all the variables that were entered into the equation, variables of sex, residence, education, and social trust, in general, can explain about 27% of cyber security.