Climate change impact refers to the responses of social economy and resources environment to climate change.Climate change risk refers to the possible losses of social economy and resources environment caused by climate change.Climate change risk assessment means the qualitative climate change impact and the quantitative climate change risk.Aiming at the principle and technical system of climate change risk assessment method,current research status,hot issues and common approaches are remarked from three aspects,namely the risk index,the risk probability and the vulnerability.Research gaps and priorities are also discussed.