This essay tries to understand a particular pattern of the relation between social movement and political party. By analyzing the development of the anti-nuclear protest in Taiwan, the author puts forth the concept of party-dependent movement. This term denotes an awkward situation where the fate of a social movement is bound to the electoral performance of a certain political party. In Taiwan, the rise of anti-nuclear voice is closely related to the democratic opening. The Democratic Progressive Party (DPP) adopted an unequivocal anti-nuclear stand ever since its founding in 1986, thus helped to collect the increasing support from the broad movement constituents. But the growing DPP has other political priorities, which means the anti-nuclear goal is often shelved to the disappointment of movement activists. As a consequence of the early convergence, the movement has not been able to re-assert its autonomy.