Climate change is still a comprehensive problem that requires global governance in international relations, and it is also an international legal issue to coordinate the collective action of the international community. From the United Nations Framework Convention on climate change、“Kyoto Protocol” to the Paris Agreement, The international emission reduction rules have been transformed from the top-down model under the Kyoto mechanism to the “bottom up” model in Paris mechanism. The development of international law in the future will be responsible for the transition of responsibility, governance of great powers, soft law governance to promote global collective action.