The international community has been facing the challenge of climate change and promoting climate change response as a core area of international development aid. In this context, this study examined the current status of climate change projects conducted by international organizations in developing countries and investigated the success factors of these projects as a reference for public or private institutions concerned with R&D or overseas business. Focusing on World Bank projects involving climate change, we reviewed 108 completed or on-going projects in 9 Southeast Asian countries, interviewed the project task managers and conducted in-depth case studies on two of Vietnam’s energy projects for qualitative analysis. As a result, it was found that the project’s commitment and responsibility were the most important success factors in the developing countries’ climate change project. Trust building and smooth communication with business partners were also found to be important success factors. Climate change projects have been generally found to be more effective in linking existing development goals and strategies. Therefore, it is necessary to establish a strategy to facilitate the involvement of the Korean government and public/private businesses in developing countries.