Platanus acerifolia was widely planted in Nanjing, starting from 1920s. 19 17, Dr. Sun Yat-sen published the "General Plan for the Founding of the People's Republic of China", praising Nanjing "in a beautiful and good region, there are mountains, water and plains, and it is hard to find a world metropolis with these three heavenly qualities and Yu Zhong", and he is determined to build an ideal capital Nanjing. Sun Yat-sen's ambition is the historical origin of the ancient capital of the Six Dynasties and the Republic of China in the 20th century. Later, 19 19 Nanjing New Construction Plan, 1920 Nanjing North City Development Plan, 1926 Nanjing City Plan and 1928 Capital Grand Plan were released one after another, reaching 1929.
Lin Yimin, director of the National Capital Design Department, said when handing over the capital plan: "All designs are century-old designs, not temporary ones, so we can't be extra cautious in design." The goal of the designers is to "make the capital not only a model of the whole country, but also comparable to the famous cities in Europe and America." (Capital plan) For the overall urban landscape, including landscaping, urban architecture and other elements, it is assumed that "in architecture, it is not only easy to create new and ingenious, but also high and low, changing freely ... the main organ is built in the center, and other rings are on both sides, just like a wing-assisted arch. Naturally, it will constrain the construction of the avenue and connect with each other. Investigating its topography, the construction is convenient and the lakes and rivers are clear. It is the easiest to choose the land and decorate the garden. All are suitable, and goodness is better than the scene of nymphs. " This creative idea adopts the European and American models in macro and the traditional form of China in micro, which is very poetic and reminiscent of the great beauty of China in Han and Tang Dynasties. The designer even gave a specific scale standard for landscaping: "Every 137 people in Greater Nanjing occupy an acre of park, which is considered the most suitable by urban designers." (Capital Planning) This standard is equivalent to parks and boulevards accounting for 40% of the city's area, and every Nanjing citizen can enjoy an average of 9 square meters of forest and garden green space-more than London, Paris and Berlin at that time. Six times that of Washington.