The project, Research of Energy Efficiency and Carbon Emission Reduction of Cool Roof in China, aims at quantifying the method of calculating energy efficiency and CO2 emission reduction of cool roof in urban regional of China, and providing the theory and data support. Firstly, we plan to search for a method which has been widely accepted through investigating and analyzing the existing calculation methods of cool roof energy efficiency and CO2 emission reduction in the world, and get one that is suitable for the urban regional conditions in China, considering the comprehensive effect of climatic and environmental factors in China. Secondly, we will evaluate the effect of energy efficiency and CO2 emission reduction of existing practice in typical cities of China, and compare it with the green roof and solar photovoltaic roof, and also analyze the value of its popularization and application in various cities in China. Thirdly, we also want to draw up a calculation software of energy efficiency and carbon emission reduction, which can be applied for main cities in China and used as a calculation tool for popularizing the cool roof.