Abstract: The South Lake of Yuhang, part of an impounding water conservancy system in the Taihu Basin, is a model of artificial transformation of natural land to benefit regional development. This research is carried out in the three aspects of landscape characteristics, co-evolution of the city and the lake and the fabric of the water conservancy system, and the spatial dynamic relationship and support relationship between the city and lake. They describe the characteristics of the "mountain-impounding lake-city" landscape system, featuring mutual influence and coordinated development in the five aspects of water conservancy construction, agricultural production, settlement construction, social background, and landscape construction in synergy within the conservation and functioning of the landscape system of South Lake and Yuhang, providing theoretical reference for the construction of the new Yuhang City.