Xi Jinping Thought on Ecological Civilization views mountains, rivers, forests, farmlands, lakes, grasslands, deserts, and glaciers as an inseparable ecosystem and communities of life which should be put under integrated protection and systematic management to ensure ecological civilization in all dimensions, all regions, and at all times. By “all dimensions,” it refers to the systematic management of all the elements of ecological civilization. By “all regions,” it means the systematic management of the entire spatial elements of ecological civilization. By “all times,” it calls for the systematic management of all the components of the temporal structure of ecological civilization. Together, it refers to ecological civilization through systems engineering. This is an innovative application and advancement of materialist dialectics’ systematic methodology in ecological civilization, and a significant contribution of Xi Jinping Thought on Ecological Civilization to materialist dialectics.