The ecological environment is not only of great significance to the party, but also related to the well-being of all people. Since the 18th National Congress of the Communist Party of China, the party has issued a series of policies and strict laws and regulations to protect the ecological environment. Among them, Two Mountains Theory is particularly prominent. This article will interpret the Two Mountains Theory of the Chinese Communist Party from three aspects: (1) adherence to the purpose and essence of ecological civilization, (2) the way to practice ecological civilization, (3) and the effect of the ecological civilization system. First of all, practicing Two Mountains Theory is an important way to uphold and improve the ecological civilization system. Upholding and improving the ecological civilization system is not only of great significance for realizing the harmonious coexistence of man and nature, but also for ensuring the sustainable development of the Chinese nation. It is of indispensable importance. Secondly, the Two Mountains Theory is a way to transform the advantages of ecological environment into economic and social advantages. From an economic point of view, the market value of time and space elements can be measured through the natural ecological system of lucid water and green mountains and non-material services. The industrial economic system is realized through the methods of material circulation, energy flow and information exchange. Furthermore, Two Mountains Theory provides a cultural basis for upholding and improving the ecological civilization system. This theory opens up a correct ecological world outlook and values, unifies the originally separated human individual and nature as a whole, reverses the originally opposed relationship between man and nature, and realizes the harmonious symbiosis between man and nature. The improvement of the ecological civilization system makes positive externality. Adhering to and improving the system of ecological civilization reflects the courage of the Communist Party of China to advance with the times. The Communist Party of China has long been committed to carrying out strategic planning and work related to ecological environmental protection, and boosting China's ecological environmental protection. The realization of the exploration of practice has undergone a fundamental change, and the height of ideological understanding has risen to a higher level, and environmental quality testing has entered a new field. At the international level, China's idea of building a community with a shared future for mankind has once again become an international hot spot. For realizing the harmonious coexistence of man and nature, upholding and perfecting the system of ecological civilization is a theoretical innovation and breakthrough. Among them, the most stringent ecological and environmental protection system and the strictest legal system are the foundation, the comprehensive establishment of an efficient resource utilization system is the direction, the improvement of the ecological protection and restoration system is the means, and the strict ecological environmental protection responsibility system is the guarantee. Adhering to and improving the ecological civilization system can stimulate the supply of ecological products, and the new economy of the integration of the tertiary industry can continue to bring lucid water and green mountains ecological resources to the best treasure, so as to maintain the development of forests, land and other natural resources to promote economic growth in the early stage of economic development. Finally, the overall consideration of the four systems of the ecological civilization system is the key to transforming institutional advantages into governance efficiency. The construction of ecological civilization involves a multi-faceted, multi-level revolutionary change that must be achieved through systems and the rule of law. The ecological environment is a scarce asset, and high-quality ecological products are an integral part of economic and social development. China should continue to explore, find the path and method of ecological and economic achievement in line with national conditions, and convert the advantages of high-quality ecological environment into economic advantages. It also seeks as many market opportunities as possible, develops relatively high-quality ecological environment resources, and uses market-oriented methods to tap the value of their resources, so that they can be transformed into a competitive advantage for economic development as soon as possible. [ABSTRACT FROM AUTHOR]