In terms of international cooperation, the Institute has cooperated with research institutions, universities and think tanks in other countries and regions, including MIT, Harvard University, World Resources Institute and The Potsdam Institute for Climate Impact Research and so on.

For example, “Tsinghua-MIT China Energy and Climate Change Project” (CECP)  with MIT;

CECP is focused on studying energy and climate change governance in China. A research alliance between the MIT Joint Program and the Institute for Energy, Environment and Economy at Tsinghua University in Beijing, China, it was officially launched in October 2011.

The objective of the CECP is to expand and improve the facilities for analysis of the Chinese energy economy and emissions, and to apply this capability to studies of alternative future pathways of economic development, energy use and emissions mitigation. The primary goal is to analyze the impact of existing and proposed energy and climate policies in China on technology, inter-fuel competition, the environment, and economic welfare by applying, and where necessary developing, both quantitative and qualitative analysis tools. The project will pursue three complementary research themes focused on understanding: the drivers of micro-level energy-related decisions by households and firms; the technical and market potential for advanced energy-related technologies; and, macro-level policy analysis.

“Tsinghua-Harvard Global Carbon Pricing Initiative” with Harvard Global Institute;

They have established a good cooperation mechanism, organized a highly collaborative team, and held influential seminars. It provides important support for policy formulation of China's national carbon market, and international experience exchange.

“Comprehensive economic analysis of climate change protection and regional air pollution control” (INTEGRATE)with University of Munster, The Potsdam Institute for Climate Impact Research and Centre for European Economic Research;

The project aims to study key scientific issues related to collaborative control of greenhouse gas emissions and air quality, and advance collaborative control theories and methods for different countries.

“Advanced Master-International Environmental Management ”with famous French universities.

By 2019, a total of 200 students have participated in the program and obtained degrees from both sides, including 150 international students and 50 Tsinghua students.