A study of the Tri-fold Trainings in Thai - American friendship School by three objectives such that ; 1) to study the principle of the tri-fold trainings in Buddhism Theravada, 2) to study the process and applying the tri-fold trainings in Thai - American friendship school and 3) the result of process for learning by the     tri-fold trainings. This research studies is documentary and field research, this studies found that

Tri-fold trainings is an importance principle in Buddhism by studies and practice perspective for the bodily, verbal and mental education advanced by virtuous seeding , especially morality is the first basic principle for life related to environment  and human beings nature from watching, listening, eating, acting, thinking in right way ,etc.  Concentration is second step for mental development to quality and virtue and last is wisdom by reasonable thought. Study the tri –fold trainings is for quality of life which free from grasping but for great beneficial virtue to individual and public.

The process and applying the tri-fold trainings in Thai - American friendship school by specified the code, regulation, rule and activities, it followed by        the principle of moral and ethical in the Buddhist way or tri –fold trainings such as morality, concentration and wisdom.

Good results are appeared to Thai – American friendship school is             1) the learners is well developed by physical, moral, mental and wisdom,               2) the school is the confidence, trust, belief, well co-operated by communities and 3) Buddhism sector have a lots the  Buddhists for helping it in spreading. These good results were come up by followed the right view, good environment and relationship , at last is well evaluated all connected sectors.