Based on a ”Site-Specificity” perspective, this study intends to discuss the development of Public Art in Taiwan, and propose a depth study of ”interaction” for Public Art. This study is expected to redefine the conventional definition of Public Art, and propose an alternative Public Art form for future development. This study focus on the ”Site-Specificity” perspective, discusses the interaction between public art and audiences, and analyzes a way to emphasis on the spirit of place and the principles to enhance the audience interaction. Furthermore, through literature review, this study will provide a prototype for ”interactive” Public Art. Consequently, this study will reach the following goals. Firstly, develop a new form of interactive Public Art. Secondly, through the focus of audience interaction, the site-specificity can be emphasized by new form of Public Art. Thirdly, though the creation of new Public Art, the image of Taiwan can be internationalized, and the level of Public Art can also be promoted.