Total quantity control is an important system to slow down global warming and mitigate greenhouse gas emissions. Though analyzing the routing selection of controlling greenhouse gas emissions, this paper discusses the concept, characteristics and content of the legal mechanism of total quantity control of greenhouse gas emissions. According to the current situations of China, this paper analyzes the system and content construction of the total quantity control of greenhouse gas emissions legal mechanism in China, and proposes to establish a new legal mechanism, which takes the government s total quantity management of greenhouse gas as the leading role, the specific emission sources of greenhouse gas emission mitigation as the main body, and the public participation and close international cooperation as the goal. This mechanism can provide the basis for the realization of legalization in the total quantity control of greenhouse gas emissions in China.