Since the early 1990s, there are two increasingly hot topics attracting numerous scholarly attentions in Chinese politics: first, it is the transformation of China's political system. Second, it is China's increasingly involvement in international regimes. Nevertheless, until now, there are only a few scholars to work out the distinctive relations between them, and even less people work on the bureaucratic politics level. By explaining and evaluating the development of policymaking coordination in the United Nations Framework Convention on Climate Change (UNFCCC), the author demonstrates the argument that international regimes have contributed to the development of coordination in Chinese Policymaking, taking the UNFCCC as a departure.