Since early 1900`s, the ideas of making use of theatre/drama as a teaching medium has been spreaded, and tried out in school and for some special social education. The result is to confirm its positive and efficient functions as educational medium. Social function of theatre demonstrates the positive value in education. Theatre, as a most valuable function, creates the situation of total involvement/confrontation which makes the mobilization of human potentiality and creativity maximal. Also theatre, for learning, provides natural and funny atmosphere through actual experience, and expresses original human nature of which education should begin from considering. The theatre for education in nature differentiates from professional theatre. To compare with professional theatre which aims at artistic outcome, the theatre, named educational theatre, places its final goal at education. Then it plays a part as teaching/learning medium. However, someone takes its aim at professional theatre work. It might be very dangerous for education which sets its goal to maximize student`s creativity. Professional work atmosphere in a sense may reduce the future of child whose growth is considered as more valuable. Because of being different each other essentially, professional theatre technique itself can not be directly put into practice for educational theatre. The direct application of professional theatre idea often brings about the problems of leaving hurt in some educational process. The essential quality of educational theatre should come from educational level, maximizing human growth, but not from professional artistic level, focusing on the audience. The purpose of the educational theatre might be found from educational medium rather than theatre art itself. The technique of educational theatre are classified into various groups by forms. There are three major kinds of educational theatre forms: Theatre-in-Education, Drama-in-Education, Creative Drama. In addition, six more forms, Children`s Theatre, Dramatic Play, Role Playing, Play Making, Participation Theatre, Developmental Drama, are made efficient use in practice.