Abstract: Chinese-style modernization is the modernization of harmonious coexistence between man and nature, and green development is its distinctive feature and outstanding quality. China actively promotes ecological construction, and the relationship between man and nature will correspondingly change from the period of slow expansion of ecological deficit, the period of rapid expansion of ecological deficit, to the period of shrinking ecological deficit, the period of partial ecological surplus, and the future will turn to the period of ecological surplus. It has experienced the agricultural civilization at the beginning of the founding of New China, the industrial civilization after the reform and opening up, and the ecological civilization since the new century. The relationship between man and nature has correspondingly shifted from the slow expansion of the ecological deficit to the rapid expansion of the ecological deficit, and to the early entry of the ecological deficit reduction period, the local ecological surplus period, and the future will shift to the ecological surplus period. Since the 18th Party Congress, the construction of ecological civilization has undergone historic, turning and overall changes in the improvement of ecological environment quality, ecological protection and restoration, green and low-carbon transformation, global ecological governance contribution, and institutional system innovation with Chinese characteristics. However, China's ecological environment protection still faces basic problems, structural pressure, root pressure and trend pressure have not been fundamentally alleviated. Therefore, China must adhere to long-termism, avoid short-term opportunism, adhere to green growth, pursue the long-term value of green development. At the same time, promoting the modernization of harmonious coexistence between man and nature with green development should include : high-quality development and high-level protection to be promoted as a whole, and overall promotion and key tackling to go hand in hand. Two wheel-driven scientific and technological innovation and institutional innovation should be promoted, positive incentive and reverse force promoted, multiple participation and collaborative governance go hand in hand, and practical exploration and experience summary should be closely combined.