According to the concept that agents shape the structure and that the structure affects the agents, it is revealed that there is dialectical thought of inter-subjectivity in constructivism. In a situation of anarchy, there are Hobbesian, Lockean and Kantian cultures regarding the structures through which the agents interact. Each culture has three degrees of internalization which include threat by force, starting from self-interest and recognizing legitimacy. The transitions between the three cultures and their internalization also lead to the emergence of dialectical relations.This paper applies the constructive logic of the elements of interest, identity, action, structure and environment to research the dynamic developments in cross-strait relations. From 1949 to the present time, cross-strait relations have passed through the dialectical changes of both Hobbesian culture and Lockean culture. If we hope for long-term peace and good governance between the two sides of the Strait, the agreements which have been signed must be honored in order for both sides to accumulate the benefits, identification, respect for and tolerance of each other and thereby construct the Kantian culture.