This paper discusses theories and methods of climate change risk studies for the research expansion in China.Climate change risks consist of three basic components including scnsitivity,exposure,and possibility.Uncertainty,future events,damages,and relativity are the major features of climate change risk. Climate change risk research includes two key steps:risk assessment and risk management,the former is the process,and the latter is the ultimate goal which is the basis for actions to address climate change.We present the main framework and methods for climate change risk research.A case study on Chinas floods risk is taken as an example of climate change risk study.Finally,we point out main aspects of climate change risk research,including ensemble-based probabilistic projection,quantitative risk assessment,risk zoning and mapping,and risk management.