Climate change is one of the greatest global challenges of the twenty-first century, and increasing evidence of present and anticipated impacts of climate change highlight the need for action. In addition to altering biophysical systems, climate change will affect human health and socio-economic well-being. In IR research field, climate change connects with security issue, international negotiation and policy-making. In this article, I try to analyze climate change issue with IR theory to research power, cooperation and institution, and to explain the possibility of new theory.