This article is a review of the whole postwar history of the Taiwanese constitutional change. It will follow the approach of the historical institutionalism to examine the constitutional changes during the period of the authoritarian state's transition to democracy. More importantly, it examines to know how the different nationalist political competitors were formed under the given conditions of the domestic and international historical structure along with the constitutional institutional legacies and how they collectively ignited the reformative power at a specific critical juncture during the constitutional moment. It also takes account of how the process of debate over different constitutional choices and its political strategic interaction achieved the Constitutional reform through the making and revising of the Constitutional Amendments.