Abstract: The article first discusses the evolution of the polder landscape in the Ningbo Plain, and then analyzes the relationship between the Yinxi polder area, Ningbo City and the Sun and Moon lake in the polder water system, and introduces the landscape construction process of the Sun and Moon lake. It points out that the layout of the Sun and Moon lake reflects the polder water conservancy system and the way of reclamation, and the lake is a specific expression of the polder landscape in this area. The article also analyzes the similarities in the development of public spaces in the settlements of the Ningbo Plain and the Sun and Moon Lake, both are largely derived from the polder reclamation mechanism. Finally, expand the view to the series of small plains in the southeast, the common characteristics of traditional lake landscape construction based on the polder landscape in these areas are revealed. It provides a new perspective for understanding similar traditional landscape construction in the coastal plain of southeast China.