This research presents a literary and critic study of the play of Saadallah Wannous who is exceeded his fame in the Arab world to the global level. He gave his whole life to the scene of a playwright and theoretician of the theater; during his forty years of cultural life he wrote more than twenty plays and two books on the theory of the play. Saadallah Wanous worked to give the theater some thing positive which had a direct role in the process of social change and to make it an instrument to detect the conditions of its society and as a tool to get people work to change this wrong situations. He aimed the theater to a point beyond the superficial respond to the crisis to its ability to explore these crises and events before they occurred, and its ability to delve deeper in its environment to affect the development and functioning of it. I have chosen the dialogue in the drama of Saadallah Wanous because it represents to him far more than just being a key element underlying the artistic construction of the drama text. With Wanous there are three patterns of the dialogue: a dialogue takes a place within the play, and there is a hidden dialogue between the audience and the play. A third dialogues between audiences themselves. At a higher level, there is a dialogue between the ceremonial of play, "the presentation and the audience" and the city, where the ceremony takes the place. So I will try in this study to follow these interactive patterns in his play and search for the techniques that are used to reach them. And then I will explain and analyze it based on the drama scripts by Saadallah Wanous throughout the lifespan of his literary career.