In the lately modern world, some scholars pay more attention on religion re-appearing in the public sphere. This research proceeds from individual level to examine the role of religion in Taiwan. Also the research tries to assess personal faith would result in positive or negative functions on the public religion. The literature review is based on the theories of Secularization, Privatization of Religion, Public Religions. The research uses the quantitative data of Taiwan Social Change Survey from Academia Sinica and concludes a regression path model.

The results of study show that privatization on Taiwanese's religious belief is powerful. The affection of religion doesn’t make differences between believers and non-believers on public social life, but the affection only appears on the part of personal field. On the other hand, pious persons and people who have religious belief apparently have more “public-religiousity” than others. The result shows that the development of public religious might have already had certain micro foundations in Taiwan.

However, because of the limitations of data, the research is unable to analyze the incongruous part between privatizated belief and personal public-religiousity. The preliminary conclusion of the research: Although the pious believers have strong public-religiousity, the privatization of general characteristic on religious belief may suppress the development of public religious; nevertheless precise conclusions will need further research in the future.

key words: Secularization、Privatization of Religion、Public Religion