Xing-ju literally means 'New Theatre' in Mandarin and denotes the non-traditional performing style in Taiwan. Xing-ju is regarded as the product of colonisation in Taiwan. The thesis began with the first emergence of Xing-ju in the Japanese colonial era at the beginning of the twentieth century, and went on to examine the development of Xing-ju and its sub-forms within a colonial historical context. Having gone through different colonial regimes, Xing-ju has developed into the local theatre form characterizing the hybridity of Taiwanese culture. My study aims to fill a gap in Taiwanese contemporary theatre history, to look at Xing-ju and its sub-forms from a post-colonial perspective, and to provide a continuous and complete Xing-ju history within a theoretical context. In addition, how Xing-ju has exemplified ‘Taiwaneseness’ while presenting multiple cultural characteristics is also examined. This thesis also draws on primary source data, obtained via field research, to analyse the characteristics of Xing-ju performances. Finally, while addressing my research questions through theoretical analysis, I also examine them through the lens of practical work. Inspired by critical syncretism, I experiment with an alternative way to explore the nature of Taiwanese culture and theatre form. With its hybrid cultural characteristics including Japanese Shinpa-geki, Chinese Peking Opera, Ge-zai Xi and Western theatre styles, I discuss how a definition of ‘Taiwaneseness’ emerges through Xing-ju.