The Purpose of this study was conducted to investigate the factors influencing SNS addiction among university students for providing the basic data to develop SNS addiction prevention program. The data were collected from 363 university students in B & K cities from 2 to 19 September, 2013 and analyzed with t-test, ANOVA and multiple regression by using SPSS 21.0 program. The significant factors of SNS addiction were average using time daily in weekend(${eta}=.116$, p=.003), SNS using time per connect(${eta}=.156$, p=<.001), communication motive(${eta}=.214$, p<.001), non-loneliness motive(${eta}=.114$, p=.010), social capital(${eta}=.127$, p=.001), psychological problems(${eta}=.381$, p<.001). And these factors explained 54.2% of the variance in SNS addiction. In conclusion, the results from this study indicated a need to develop the intervention program to prevent SNS addiction for health promotion of university students.