Abstract: Directed by the scientific connotation of Xi Jinping's ecological civilization thought, this paper systematically analyzes the logical relationship between the basic principles of ecological civilization construction and its system construction, and discusses the compatibility between the goals of the ecological civilization construction and of Global Green low-carbon sustainable development. On the basis of this, the paper clarifies the "two-stage" targets of the construction of ecological civilization from 2020 to 2050:By 2035, a spatial pattern, industrial structure, production methods and lifestyles for resource conservation and environmental protection will be basically formed, the quality of the ecological environment improved, the modernization of national governance systems and capabilities in the ecological environment basically achieved, and the goals of beautiful China basically achieved. By 2050, a green development model and way of life will have been established across the country, a harmonious coexistence between man and nature realized, the modernization of China's environmental governance system and capacity realized, so as to complete building beautiful China. From the construction of the ecological civilization system composed of the five perspectives of the construction of the ecological cultural system, ecological economic system, target responsibility system, ecological civilization institution system, and of ecological security system, the action-oriented tasks of the short, medium and long term are proposed for the construction of ecological civilization in the year 2050.