According to the guideline of National Key Research and Development Project, this project aims at developing a world-class Integrated Assessment Model (IAM) in China,which will be used to assess the impacts of climate change on economy system. The objects of this project are to ① Improve the spatial resolution of Earth System Model (ESM);② Modify the Integrated Assessment Model;③ Couple the ESM and IAM;④ Evaluate the impacts of climate change on society and economy. This project will solve two key scientific questions: how to identify the impacts of climate change in the IAM; How much the impacts of climate change on economy in China. Meanwhile, two techniques will be developed to complete the mission of this project: Simulate of small-scale human activities in the EAM and spatial and temporal resolution match of ESM and IAM.