Zeatni was great not only as an actor and a writer of No Drama, but also as a theorist who had performed his esthetic and educational theory on a basis of the Buddhist logic. The present thesis has made inquire into three basic principles of his educational theory, how to get training to become a good actor. Of these three principles, the first one is 'Hana' meaning a flower fresh and charming, that is a principle of exhibiting skilfulness performing the drama. The second one is 'Yugen' meaning profound beauty, that is an esthetic principle ruling over act and dance, song and music, and every thing else composing the drama. The third one is 'Utsuwa' meaning a case or a vessel, that is a principle of actor's talents or genius. These principles are clearly explained on a basis of the Buddhist philosphy in his secret writings which were given only to the permited successors.