The purpose of this study was to explore the levels of anger , anger expression and suicidal ideation in Korea adolescents and identify the differences in anger , anger expression and suicidal ideation according to school level and gender. The specific aims were to test the differences in the levels of anger and anger expression between middle school and high school students and between male and female students, and to test the defferences in the levels of anger and anger expression between two groups based on the suicidal ideation scores. To test the differences between the two group , We used the cutoff threshold of Sokero et al. (2003) far clinically significant suicidal ideation . Thus , We classified the participants with suicidal ideation scores of 6 or more into a high-risk group and the participants with the score less than 6 into a low risk group of suicidal ideation