This essay reviews the international diplomatic pressure China is faced in the negotiation of the international climate change mechanism in 2012，China’s response of actions and analysis of the motive，as well as the critics from home and foreign media. Also，the essay delves into the cost and methods for China to achieve its goal of emission reduction，as well as the embryonic form of an international mechanism for information transparency. At the last part，the essay points out a path change in the future negotiation，including a conversation platform for China and other major economies and carbon dioxide emitters.