This thesis is composed of 3 objectives:  1) to study the principles and methods in Dhamma practice of the Tanang Lenang 60 years Chalermraj  Meditation Center,  2) to study the Insight meditation Master’s teaching model of the Tanang Lenang 60 years Chalermraj  Meditation Center,  3) to study on the success factors of Meditation Practice in the, Tanung Lenung  Chalermraj  Meditaion Center 60 years.

This research is a qualitative study by using documents and the field data collecting with 2 types; the interview and participatory observation.

          The results were found as the followings: the insight meditation practice according to the Four Foundation of Mindfulness of the Tanang Lenang 60 years Chalermraj  Meditation is based on the practical principle and technique by the continuing mindful awareness in the present of the Dhamma’s phenomena, i.e., on the truly state of the Physic,  Feeling, Consciousness and Dhamma. The model in teaching  of the  Insight meditation Master is mainly followed to the teaching in Tipitaka and practiced on the technique of the Rising and the Falling concentration. The process on practice begins with the interchanging between walking meditation and setting meditation, then, being mindful in the tiny postures from the awaking to sleep. The master will increase the higher steps to the individuals while they are coming to test their states of practice.  In order to develop the mindfulness and wisdom, the practitioners will see clearly the various dharma-states as factually appeared until the wisdom considering three Characteristics shall be arisen. On the factors leading to the success of Meditation Practice, it was found that: The place is suitable for meditation practice, There is the Skillful Masters who are expert in practice can advice and train In the practice of Insight meditation based on the Four Foundatiojn of Mindfulness.

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