The theme of this thesis is the post-war Taiwan regional fiction and the image of outsider in it. The thesis tries to clarify the developing context of modernism in Taiwan regional fiction. In common sense, from so called Modernism Era in 60’s, literature in Taiwan experienced these different eras: the Regional Literature Era in 70’s ,the Urban Literature Era in 80’s, and the Burgeoning Era and the Postmodern Era in 90’s. The thesis tries to demonstrate that after modernism was introduced into Taiwan in 60’s, modernism in Taiwan has actually existed, but tended to be covered under the repression of the political and modernity power. At the same time modernism in Taiwan has gradually interacted with the belated-modernity on this island and developed itself , and the image of ousider in the Regional Literature is the fighting site of Modernism Literarture and the Regional Literature.