The Fifth Plenary meeting of the 18 th Central Committee put forward the idea of creative green development, which become the guide which is important concept of economic and social development in our country in the future. The contradiction between resource environment and economic development is becoming more and more outstanding with the speeding up of urbanization process in western region. The coming of big data and information age, makes the wisdom of ecological city construction to be the mainstream direction of urban development, and green development also become the core of the ecological city wisdom. In ecological concept gradually deepening of the information age, the construction of smart ecological city becomes the mainstream direction, green development also becomes the core of the smart ecological city. The path and strategies of promoting green development of western cities based on the smart ecological cities were presented in this paper, through the analysis of the background of the smart ecological city construction, the calculation of the environment carrying capacity and the ecological footprint, as well as the target for the sustainable green development of the western cities. The Fifth Plenary meeting of the 18th Central Committee put forward the idea of ​​creative green development, which became the guide which is important concept of economic and social development in our country in the future. The contradiction between resource environment and economic development is becoming more and more outstanding with the speeding up of urbanization process in western region. The coming of big data and information age, makes the wisdom of ecological city construction to be the mainstream direction of urban development, and green development also become the core of the ecological city wisdom. In ecological concept gradually deepening of the information age, the construction of smart ecological city becomes the mainstream, green development also becomes the core of the smart ecological city. The path and strategies of promoting green development of western cities based on the smart ecological cities were presented in this paper, through the analysis of the ba ckground of the smart ecological city construction, the calculation of the environment carrying capacity and the ecological footprint, as well as the target for the sustainable green development of the western cities.