The purpose of this study was to investigate the effects of short-term Maum Meditation and to compare effects according to the length of the training period on mental health of teachers. In this research, 2 types of design were used which were one-group pre-posttest design and descriptive study. In short-term Maum Meditation group, 2 times of surveys were carried out, 75 teachers in the faculty training filled out the structured questionnaire. In Long-term Maum Meditation group, 101 teachers who were attending Maum Meditation above one-year filled out the structured questionnaire. The data were analyzed by SPSS WIN 14.0 program. The results showed that there was a significant difference in mental health including 9 subscales for short-term Maum Meditation group. Also, in long-term Maum Meditation group, there were significant differences in mental health excepting paranoid ideation. It was founded that Maum Meditation is the way for the mental health promotion in short-term and long-term period. So it is necessary to develop program according to training period for not only clinical application but also to strengthen coping ability for stress.