Reducing GHG emissions of international law to promote the emergence of carbon finance.Carbon finance is an unique branch of the environmental finance. Whether or not subj ect to the jurisdiction of international law，carbon trade need financial support and stimulation. With the development of carbon market and carbon credits，the development of carbon finance needs fair and effi cient in the framework of international law . Therefore，analysis of the concept and development of carbon finance， will be able to promote the scientific development of carbon finance under the international law .