The purpose of this study is to see the remedial effects of therapeutic theatres on the audiences and the people involved the performance including the director, actresses, and volunteering guides, by systematizing its production and staging process. This study especially focuses on the actual performance I participated, titled ≪A Duck and a Princess≫. The objects of study were 20 drama therapists involved in the performance including the director, actresses, and volunteering guides and its 899 audiences such as teenagers(in/out of the sheltering organization), migrant women, single mothers, poor mother-and-child families, socially neglected people like depressed women and others who are interested in arts therapy or counseling therapy. I analyzed its producing and staging process with 'a qualitative research method,' using a narrative way that I, an actual participant, looked back on all the procedures I've experienced in that performance in the light of the drama therapy and tried to illuminate its practical meanings. These are the results of the analysis: First of all, I found that a therapeutic theatre has an exactly same format with drama therapy which has three elements; theater experience(warm up activity), watching-expressing(main activity), and encounter-sharing (finishing activity). Both cases, audiences can participate in the performance as active participants, not passive observers. Second, the process of therapeutic theatres helps drama therapists to have reinforced ability and growth. All drama therapists(the director, actresses, and volunteering guides) who engaged in this performance learned how a person's private story can be an universal story by fictionalizing it. Also direct encountering with audiences strengthened their intuitive power, catholicity and quickness. Third, the audiences had chance to gain self-awareness and recovery. Unlike other typical plays, through active involvement in the performance, they examined their own experiences and had opportunities to determine to try to make difference in their lives. We can call it healing process. Fourth, this therapeutic theatre created a new performance pattern by creatively harmonizing a typical play and a drama therapy work. Audiences in this new performance pattern are main characters just like the director and actresses. They also created their own dramatic reality and various meanings. Therefore, the therapeutic theatre ≪A Duck and a Princess≫ had significance in the respect that it sought to find out various practical methods based on the traditional theater play and drama therapy theories. But here I want to add some suggestions for its development. First, we still need to study more about diverse stories and methods to gain audiences' sympathy and active participation in the performance. Second, we need to study flexible dramatic constructions that can apply audiences' reaction into the performance immediately.