The goal of this study aims to examine the moderating effect of intentional rumination on the relationship between Posttraumatic growth and the psycho-social adjustment of college students who experienced school violence trauma. For this purpose, a questionnaire survey was conducted at universities in Seoul and Gyeonggi - do during March of 2016. The subjects of the study were limited to college students who reported that they experienced trauma in the school violence of adolescence. The subjects were 219 which 121 women and 98 men. Results of this study are presented as followings: First, the moderating effect of intentional rumination to the relation between the Posttraumatic growth and the depression is found to be not statistically significant. Second, the moderating effect of intentional rumination is confirmed to work among the Posttraumatic growth and the interpersonal competence, the subjective well-being. These results indicate that the effect of Posttraumatic growth on interpersonal competence and subjective well-being is low when the intentional rumination is low. On other hand, if intentional rumination is high, the effect of Posttraumatic growth on interpersonal competence and subjective well-being is greater. Based on these results, it is suggested that intentional rumination is needed in order to improve the psycho-social adjustments of college students who experienced school violence trauma. And limits of this study and recommendations for follow-up studies were presented.