Xi Jinpings important expositions on the harmonious coexistence between man and nature feature a problemoriented approach. In their formation, which involves theoretical continuation, practical demonstration, and innovative development, they cover three major generative aspects: ecological cognition based on practical understanding, ecological exploration with a priority on protecting nature, and ecological governance focusing on building a community of life. These aspects integrate the methodology of “dialectical unity”, the value theory of “nature first”, and the practice theory of “harmonious development”, forming Xi Jinpings developmental logic system from concept to action, from theory to practice, and from the individual to the whole. To promote the construction of ecological civilization in line with Xis statements of harmonious coexistence between man and nature, the key is to establish the ecological idea of harmonious coexistence and guide actions with the idea, that is, building a modern ecological system and using the system to promote reform, and making a systematic strategy of ecological development and using the strategy to plan the future.