The Jiangsu-Zhejiang-Shanghai boundary district of the lower reaches of the Taihu Basin is a plain area with low-lying terrains and complicated hydrological system;it is a region where the threat of flood and waterlogging is most serious and the water environment deterioration most obvious.In the meantime, the water resources contradiction stands out because of its location-in the fringes of three administrative areas.To mitigate flood and waterlogging disasters, the fringe polder constructions as well as the maintenance are one of the key problems to the water resource utilization and water environment improvement in the district.After analyzing the development history and situations about fringe polder distribution along the boundary area, the polder system problems within the given district are discussed from the following aspects: the polder area change, water area ratio and the length of polder dykes, and so on.The appropriate polder scale and the drainage power of waterlogging are suggested.Finally, several suggestions on fringe polder development are proposed.