With the increase in world population and limited energy resources, countries are facing the problem of energy consumption. The crises that threaten countries and human societies are the limited resources of non-renewable energy (fossil fuels) and the increase in environmental pollution caused by excessive consumption of fossil fuels, which are the necessity and importance of paying attention to the use of energy resources. Shows renewable. The close relationship between economic and environmental issues has led to the emergence of new approaches in the field of international environmental law, one of the most important of which is the green economy. Since one of the most important goals of the green economy is to reduce greenhouse gas emissions, the use of renewable energy sources is a shortcut to the green economy. Renewable, clean, abundant and reliable energies, and if properly developed, can play an important role as sustainable energy sources in achieving sustainable development goals. The main reason for emphasizing the use of renewable energy, in addition to helping to solve environmental problems and prevent the loss of fossil fuels, is the protection of natural resources for future generations. They are important in the green economy and sustainable economic development. In this regard, the main purpose of this article is to examine the main role of Renewable Energy in the Development world and thru study Iran China cooperation in Renewable Energy, try to find out how it can be important for both Developed and Developing countries.