In this study we have tried to explore the methods of mindfulness training and analyzed the psychological meaning of the mindfulness through interview with participants of mindfulness based training group. Mindfulness is now trained in a systematic program developed by Kabat- Zinn's Mindfulness-Based Stress Reduction(MBSR), which is different from the original 念處(Sati) training in the oriental religious tradition. The mindfulness training composed of nonjudgmental attention on the breathing, physical sensation of body scan, sitting meditation and the mindfulness practice in everyday life. The effects of the 'secular' mindfulness training was follows: the reduction of chronic disease such as pain and cancer, the positive effects on the psychological disorders such as depression and anxiety. Add to this, the mindfulness training increased the individual transformation and positive psychology of self-regulation, empathy, self-compassion and connectedness. The qualitative analysis of interviews with the participants to 8 weeks mindfulness training group showed that the purpose of mindfulness was staying with present moment, awareness of conscious contents(thoughts, felling, emotion), decentering and acceptance of experience, which leads to awareness and insights to the self and the world. It was discussed the difference of cognitive insights of mindfulness training and the transpersonal awareness of the religious 念處(Sati) training.