The purpose of this study is to investigate the relations among anger, suicidal ideation and internet addiction in male high school students. In order to get the data by self-report questionnaires, 191 subject were selected from 1th to 30th of April, 2011. The collected data were analyzed using SPSS WIN/17.0. There were significantly positive correlations between suicidal ideation, anger and internet addiction. Internet use hour and anger explained 29.0% of variance for internet addiction. The findings of this study suggest that self-management and interpersonal relationship program should be need to prevent problem of internet addiction.