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The purpose of this study was to identify the relationships of mental health and internet use in Korean adolescents. Also, it was intended to provide guidelines for reducing internet overuse based on the influencing factors of internet use.Participants in this study were convenient sampling, and selected middle and high school students in Incheon metropolitan city, South Korea. Internet use and mental health of adolescents were measured by self-reported instruments. This study was carried out from June to July 2014. 1248 participants were collected overall except for insufficient data. The data were analyzed by descriptive statistics, t-test, ANOVA, Pearson's correlation coefficient, and multiple regression.There were significant correlations between mental health and internet use. The significant influencing factors of internet use were normal internet use group, mental health, middle school, internet using time on weekends (3 h or more), internet using time at a time (3 h or more), and high school record. These six variables accounted for 38.1% of internet use.The results of this study will be used as guidelines for reducing internet overuse of adolescents.There were significant correlations between mental health and internet use.By identifying the influencing factors of internet use, this study provided guidelines for reducing internet overuse.The poorer mental health and school grades, and the middle students, the more heavily relied on internet usage.It is necessary to regularly provide screening test and guidelines for potential risk group of internet overuse.