The purpose of this study was to identify the mediated moderating effect of explosive behavior through gender between negative emotion and suicidal ideation. It was conducted to measure depression, anxiety, explosive behavior and suicidal ideation from 644(322 male, 322 female) university students. The mediated moderating effect was analyzed through hierarchical regression analysis and path analysis. And the results of simple slope test were presented graphically. As a result of analysis, first, there were positive relationship among negative emotion, explosive behavior and suicidal ideation. Second, gender had significant moderating effect within the relationship of negative emotion and suicidal ideation. Third, explosive behavior had significant mediating effect within the relationship of negative emotion and suicidal ideation. Forth, gender had significant moderating effect within the relationship of explosive behavior and suicidal ideation. Implications of these results were explored in relation to the importance of negative emotion and explosive behavior that could be taken to improve suicidal ideation according to gender. In addition, this implication and suggestions for future research are provided.