Abstract: In international relations theories, realism, liberalism, and constructivism have different opinions about the harmonious and conflict in East-Asia regionalism cooperation. There will be three effects in the process of East-Asia regionalism cooperation such as accumulative conflict effect, accumulative harmonious effect, and conflict-harmonious commute effect. Since recent East-Asia regionalism cooperation is closed to conflict-harmonious commute effect, the avenues to promote it to the harmonious situations are: the power governance in the paradigm of realism, institution governance in the paradigm of liberalism, and the norms governance in the paradigm of constructivism.