Internet addiction refers to excessive using of the internet (daily over 3 hours). This phenomenon as a illness, psychological or social harm, is a widespread problem with serious consequences for the students, is increasing. The present study aimed to investigate the related factors with internet addiction among female students of Yazd University residing in dormitory at academic year 2012-2013. This research was a descriptive-correlational study. 335 students were selected through cluster sampling. The research tools were Internet Addiction Scale, NEO Five Personality Factors Inventory and Glass's Perception of Social Interaction Questionnaire. Data were analyzed by correlation coefficient, independent t test and regression analysis. The results showed a significant relationship between personality types and internet addiction at p<0.01 and p<0/001 level. There was also a significant relationship between personality types and perception of social interaction at p<0/01 and p<0.01 level. Also, the results showed a significant relationship between perception of social interaction with Internet addiction at p<0.001 level. There was a significant relationship between undergraduate and graduate students in the rate of internet addiction (p=0/01) but there was no significant relationship between two groups in the rate of perception of social interaction.