Abstract: Throughout the process of human development, ecological civilization and intelligent civilization have gradually replaced primitive civilization, agricultural civilization and industrial civilization, becoming the main theme of human civilization and development, while green smart cities conform to the trend of ecological civilization and intelligent civilization and become the inevitable choice of human urban construction today. At present, in order to achieve the goal of sustainable development, countries around the world have formulated plans to promote the construction of green and smart cities. According to incomplete statistics, more than 400 cities around the world have smart city development plans such as "smart city", "smart city" and "digital city". As the world's second-largest economy, China's rapid economic development has also recognized that growing environmental problems have become a constraint to achieving the Sustainable Development Goals. At the 2018 National Eco-environmental Protection Conference, General Secretary Xi Jinping emphasized the importance of ecological civilization construction and development, and green and smart have become important guidelines for global urban construction. This report discusses the connotation and extension of green smart cities, summarizes the humanistic, ecological, intelligent and systematic characteristics of green smart cities in China, and sorts out the development process of green smart cities at home and abroad. On the basis of drawing on the theory of composite ecosystem and the sustainable development index system at home and abroad, a green smart city evaluation index system containing 18 indicators in three major fields: green city, smart city and cultural city was established, and a calculation model was constructed, and the green and smart development level of 285 cities at the prefecture level and above in China was calculated and analyzed. We find that the eastern cities with large population scale and high economic development level are in the forefront, while the western cities with small population size and low economic development level rank low, and the characteristics of high east and low west are significant. At the same time, the level of green and smart construction in coastal cities along the river and provincial capitals is also relatively high. In view of the low level of green, smart and humanistic coordinated development within cities in China's green smart city construction, the weak role of core central cities in driving surrounding cities, and the lack of distinctive characteristics of marginal small and medium-sized cities, we put forward problem-oriented, goal-oriented and engineering-oriented countermeasures and suggestions. Keywords: green smart city; Urban development; urban pattern; Index; Abstract: Throughout the process of human development, ecological civilization and intelligent civilization gradually replaced primitive civilization, agricultural civilization and industrial civilization,become the main melody of human civilization and development. Green and smart city follows the trend of ecological civilization and intelligent civilization,has become the inevitable choice of urban construction. At present,all countries in the world have formulated plans to promote the construction of green and smart cities in order to achieve the goal of sustainable development. According to incomplete statistics,more than 400 cities around the world have developed smart city plans like“smart city”,“intelligent city”and“digital city”. As the world's second largest economy,China,while developing rapidly,has also realized that the increasingly severe environmental problems have become the key to prevent it from achieving its sustainable development goals. President Xi Jinping highlighted the importance of building and developing ecological civilization at the National Ecological and Environmental Protection Conference in 2018.Green and smart have become important guidelines for urban construction around the world. This report discusses the connotation and denotation of green and smart city,summarizes the four characteristics of China's green and smart city,which are human-based,ecological, intelligent and systematic,sorts out the construction process of green and smart city at home and abroad. On the basis of drawing lessons from the current situation of complex ecosystem and domestic and foreign sustainable development index system,a green and smart city evaluation index system including 18 indicators in green city,smart city and humanistic city is established. Based on the index system,the report constructs a computational model and analyzes the development level of green and smart cities in 285 prefecture-level cities and above in China.The report finds that eastern cities with larger population and higher level of economic development rank top of the list,while western cities with smaller population and relatively backward economic development rank at the bottom,and the characteristics of higher east and lower west are significant. Meanwhile,cities along rivers and coast and provincial capitals are also at a higher level of green and smart development. There are some problems in the construction of green and smart cities in China， such as the low level of cities' inner green,smart,and humanistic coordinated development,the weak driving force for surrounding cities of the core cities,and the non-distinctive characteristic of small and medium-sized cities. For these problems,the report puts forward some comprehensive controlling countermeasures and suggestions from problem orientation,target orientation and project orientation. Key words:Green and Smart City; Urban Development; Urban Pattern;Index; Sustainable Development（AI翻译）