Reviewing the post-war political history of Taiwan, it is no doubt that Free China and Formosan Magazine events are the key points. Coincidentally, these two antigovernment movements have some similar characters, but there seem no similar effects. Therefore, this article hopes to explore the processes of these two movements by applying the analytic framework among the international political environment, the KMT regime, and the antigovernment movements. Furthermore, this article also hopes to realize the relationship between the movements and the transitions of Taiwan's democracy by comparing the structures of these two movements. The research detects that these two movements exactly exist structural differences. For example, the ethos of Free China event is a sort of integration of elites, but the character of the Formosan Magazine event belongs to the mobilization of civilians. Moreover, the important discovery of this research is that the transition of Taiwan's democracy was not only affected by the changes of the international politics, but also controlled by the unequal power structure built by the KMT regime. Subsequently, the opposition movements converted from the propitious international environment and the KMT's power structure, it gradually forced the KMT toward the reformation of democracy under the power of the Taiwan's masses.