The global climate change has intensified the frequency and intensity of extreme weather disasters such as torrential rain and flood，high temperature and heat wave and heavy smog，which have affected a city's ecology，economy and social systems to different degrees and hindered the normal operation of urban functions.The adaptation of a city to the climate change includes not only the response and adjustment of various elements within the three systems of ecology，production and living，but also their mutual integration and coordinated response.Starting from basic elements of urban society，economy and ecology，this paper analyzes the urgent needs of ecological priority，green production and smart life to adapt to climate change，explores ways and measures for a city's ecology，economy and social systems to adapt to extreme weather and climate and points out that an effective way for a city to cope with extreme climate events under the climate change is to establish an intelligent urban green technology system and a smart urban social management system of disaster prevention and reduction for the purpose of increasing the city's ability to adapt to the climate change.