Xi Jinping Thought on Ecological Civilization is an important part of Xi Jinping Thought on Socialism with Chinese Characteristics for a New Era, which is rich in connotation and profound in depth. Its core ideas mainly include ensuring harmony between human and nature, lucid waters and lush mountains are invaluable assets, and green development mode. It is not only an important follow for the construction of ecological civilization, but also the direction of economic and social development, which has a strong guiding and practical significance for all work, including geological work. To realize harmony between human and nature must understand nature scientifically. Geological work, as the work of studying the earth system, is an important work to explore natural laws, find existing resources, and investigate natural ecology. It is an important prerequisite for realizing harmony between human and nature. While recognizing nature, geological work will also have a certain disturbance to the ecology, but we cannot unilaterally think that geological work will destroy lucid waters and lush mountains. Two Mountains Theory profoundly reveals the relationship between ecology and development. As long as geological work accurately grasps and implements the Two Mountains Theory, it can realize lucid waters and lush mountains are invaluable assets. Geological work should adhere to the concept of green development, adopt a green development mode, serve the construction of ecological civilization and economic development, and help realize harmony between human and nature.