This book mainly reviews the progress, effectiveness, and transformation mode of China's current practice of "Lucid Waters and Lush Mountains Are Invaluable Assets" Theory (abbreviated as the "Two Mountain Theory"). A total of 10 typical cases of ecological restoration, ecological industry, ecological market and green finance have been formed based on the theory. In the future, the Center for Ecological Civilization will continue to strengthen the practical exploration and theoretical innovation of the "Two Mountains Theory" to provide support for achieving new progress in ecological civilization construction and building a beautiful China.