The main function of set design is to re-interpret and reform the concept of the script, and create the visual space and symbolic meaning for the play. There are two kinds of space when dealing with dramatic event, one is the space for acting, the other one is for the audience to believe; actors present the story to the audience, and the most important duty for the set design is to create the illusion of the space and enhance the dramatic effect. The original musical play describes students of Taiwan Normal University facinggraduation and chang, this fictitional play symbolizes design direction regarding the change in indoor and outdoor scenes, realistic musical play story shows a way to think functionally about the space. It converts and reproduces the existing space. Through the interaction of performer and stage space and audiences establishment to create the space again in any possibility. It will discuss the topic with stage design process method.