This study aims to investigate the changes and trend for the official policies, celebration activities, and ceremonies of national holidays¡¦ in Taiwan over the period of 1950 to 2004. The interactions and confrontations among competing authorities in defining the time and space for national holidays, and the process by which they influence Taiwanese people¡¦s collective memory are further studied. The method applied is literature review and historical analysis. The findings show that the formation and development of Taiwanese national holidays¡¦ are the outcomes of a love story and sometime struggles between political and other social powers. Utilizing the uniqueness and the special sphere of time and space, politicians and other groups co-construct a collective memory that serves their own interests. There are affinities between national holidays and religions, as the legitimacy of their existence, activities and ceremonies both come from the ¡§sacred canopy¡¨ provided by the belief system. The later grants the national holidays with sacred values, and thus made the existence, activities and ceremonies of the former possible. However, while the making of national holiday¡¦s collective memory is dominated by political authorities, they have their limitations. As we shall present in the study, there are competing forces in the pursuit of legitimacy. These interventional and balancing factors include economic factors, ideologies of confronting political parties as well as leisure culture. They are actually the most important factors in the changes and development of national holidays. They come from and also reflect on the social change. It is also clear that the ¡§the holiday overset phenomenon¡¨ has started since the Lee Deng Huei period.