G20作为全球治理的重要平台，有着作为非正式对话的机制的优势。随着气候议题的影响逐步扩大，全球气候治理成为二十国集团的重要议题。对二十国集团气候议题的历史梳理分析，G20因为自身的非正式对话机制可以与气候多边主义形成有机互动，并且发挥自身的灵活性优势来弥补全球气候治理产生的弊端。但也因为非正式的机制，G20面对着合法性与有效性的质疑。如何协调二十国集团在气候治理中非正式机制的优势与缺陷，是未来二十国集团发展的方向。

As an important platform for global governance, the G20 has the advantage of being an informal dialogue mechanism. As the influence of climate issues gradually expands, global climate governance has become an important issue for the G20. Based on the historical analysis of the G20 climate issues, the G20 can form an organic interaction with climate multilateralism because of its informal dialogue mechanism, and make use of its flexibility to make up for the shortcomings of global climate governance. But also because of the informal mechanism, the G20 faces questions about its legitimacy and effectiveness. How to coordinate the strengths and weaknesses of the informal mechanism of the G20 in climate governance is the direction of the future development of the G20.