Since the late of 1980s, constructivism has risen rapidly as the officially accredited contender to the established core of the international relations (IR). In the three decades, it has become a common approach in IR, as time go by, it faced stagnations, crisis, and paradoxes, toward to a crossroad or cul-de-sac? Particularly, the research of international relations is experiencing the debates of "the science of positivism" and of "the end of theory," the stagnations of constructivism is a miniature of the debates. Different generations of constructivists tried to find opportunities with various perspectives for breaking through the paradoxes, including in meta-theory, substantial theory, empirical research, and constructivism itself for recreating the future of constructivism.