This dissertation in aimed to examine Thai educational system in order to seek its development according to Buddhadasa’s philosophy. It is based on documentary research both from primary and secondary sources. Its content reveals a gradul variation of Thai education throughout the history. This variation implies certain problem e.g. the problems of educational Paltern, social values of students, and so on under certain Thai religion. According to Buddhadasa, the right educational system can provide students with three kinds of Knowledge : The academic (Buddha-sastra), the knowledge of moral practice (Dhamma-sastra) and the knowledge of socialization (Sangha-sastra). His philosophy attempts to incoporate the Buddha’s doctrine within Thai education in order to equip students with right knowledge and right conduct. Since Monks always help education Thai Buddhists directly, Buddhist monk’s education needs to follow Buddhadasa’s philosophy and more support from the government. Monks who are well-disciplined and academically knowledgeable can be social exemplar can qualified to teach people.