Abstract: The protection and development of plant diversity, an important component of the natural ecosystem, is one of the material foundation of human sustainable development. It is significant to maintain the balance and stability of ecological environment. It is also an important part of the construction of ecological garden cities in China today. Taking the first phase of Shanghai Binjiang Forest Park as a case, this paper summarizes the experience of restoring and rebuilding the natural habitat and protecting and developing the existing plants in the process of construction. This study also explores effective methods for plant diversity protection in the design and construction of country parks. Suggestions and references for future construction of urban country parks and greening transformation of the existing green space are generated accordingly.