This research is of 3 objectives namely :- 1) to study the Dhamma principles in the way of life, 2) to analyze the Buddhist principles in the life style of Mr. Pridi Banomyong, 3) to analyze and synthesize the Buddhist Pridi Banomyong’s way of life as a model for general public in Thai societies.

From the research, it is found that the Buddha Dhammas which help the human beings to achieve the success emphasize the wisdom which is the selection of the Dhamma principles according to suitability for life existence with nature intelection with the pragmatic means which lead to happiness for the individual, the general people and the societies such as 1) Catu – Gharāvāsa - dhamma, 2) Catu - Gihisukha, 3) Satta -Sappurisadhamma, 4) Cha - Sārān²yadhamma, 5) Panca - ¾rayavaddhi and 6) Dasa – Rājadhamma, 7) Catu - Bala 8) Catu – Saṅgahavatthu.

Mr.Pridi Banomyong, the senior Statesman was of faith in Dhamma and practiced it in his everyday life. There were his many outputs in many roles such as :- the politician roles which had honesty in duty, the ruler’s roles which had given the peace to the people and to the rivals, the lawyer’s roles which taked the law in helping the people and the societies, the economist’s roles which intended to develop the Thai people’s lives, the educator’s roles as the leader in establishing Thammasat University and the modern education system and father’s role as in leadership of his warm family with his wife. Because of his understanding the Dhamma in Buddhism such as Tilakkhana, Paticcasamuppāda and concept of Phra Sri-Araya’s era. So, he used the Buddhist principles to create happiness to the Thai societies which he called  “A Noble Society.”

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Mr.Pridi Banomyong’s life was the model of life style which was of three levels of utility according to the Buddhist principles such as 1) Oneself’s utility (attha) which he used as the Buddhist principle in easy life style and endured the suffering which has Catu – Gharāvāsa - dhamma, Catu - Gihisukha, Satta - Sappurisadhamma all of which were Dittha-dhammikattha in the present life in the profane concept and Samparāyikattha or the life’s goal in the future world (life after death). 2) Other people’s utility is of two levels such as Uttha - Parattha with Uppayattha in the principle of Cha - Sārān²yadhamma, Panca - ¾rayavaddhi, Dasa - Rājadhamma, Catu – Bala, and Catu - Sangahavatthu. 3) Ultimate utility (Paramattha - Payojana) which he practiced at the high levels of Dhamma in his everyday life.