Cities are the regions with the densest population and the most concentrated economy in China. The green accessibility in the urban built-up areas is an important factor restricting the happiness of urban residents. With the continuous development of cities, the central urban areas of megacities are faced with various challenges, such as the mixed functions of different types of land use, the interlacing of new and old communities, the shortage of ecological land, and the fragmentation of the ecosystem. Promoting the expansion and quality improvement of urban ecological land in central cities and continuously enhancing green accessibility is one of the difficult problems in the transformation and development of megacities. This study proposes the paths for how to enhance the ecosystem in the central urban areas of megacities from two aspects: policy and technology. At the policy level, in combination with the ongoing construction of beautiful cities in China, it is proposed to leverage urban renewal and transformation, the construction of sponge cities, the construction of climate-adaptive cities, and other initiatives to promote the construction and renovation of beautiful communities in different categories. Taking communities as the main body, policy suggestions are put forward to improve the construction of the ecosystem. At the technical level, in combination with initiatives such as green transportation and green buildings, operable paths are proposed in terms of energy-saving renovations, three-dimensional greening, and the integrated promotion of infrastructure. This policy proposal is currently being explored and implemented in the construction of beautiful Guangzhou.

Uncertainty Megacity, Beautiful City, Central Urban Area, Ecosystem