The purpose of this study is to explore the effects of Mindfulness Based Stress Reduction(MBSR) Program on attention and emotional regulation style in male high school students. The participants of this study are 32 academic male high school students who live in J City, Chonbuk Province. 16 participants were assigned to an participation group and 16 participants were assigned to a control group. The MBSR program ran for eight sessions over the course of four weeks; each session was 90 to 100 minutes long. A total of six people, three from the participation group and three from the control group, dropped out during this program. 26 participants (participation group n=13, control group n=13) were assessed for Mindfulness Scale, Frankfurter Aufmerksamkeits – Inventer (FAIR) and Emotional Regulation Style Scale during pre-test, post-test, and 6-week follow-up periods. The results of this study were as follows; Mindfulness, selective attention, sustained attention, active emotional regulation style of the experimental group were significantly increased more than those of the control group. Avoidance-distractive emotional regulation style of the experimental group were significantly decreased more than those of the control group. The effect were maintained at 6-week follow-up. Self-control, support-seeking emotional regulation style were not significant difference between the experimental group and the control group. Finally, the implications and limitations of this study were discussed, and suggestions were given for ruther research.