This paper presents a brief introduction of integrated assessment models (IAM) of climatic change. Then the Integrated Model to Assess Greenhouse Effect 2.0 (IMAGE2.0), a multi disciplinary, integrated model designed to simulate the dynamic of the global society-biosphere-climate system and to evaluate consequences of climate policies is introduced. This suggests that IAMs are useful tools so far to quantify as much as possible the cause effect relationships of the climate change problem and the cross-linkages and interactions between diverse issues concerned. Chinese research community should pay more attention to the development of IAMs so as to broaden our understanding of climatic change and to aid the decision making process about influences of human activities on environmental and climatic change.