Abstract:The current situation and problems of water system in Chengnan New District of Lishui District in Nanjing are analyzed and investigated. According to the master planing and the development demand of the regional cities, the water system is positioned reasonably and the control standard is formulated. The water system pattern is adjusted to realize the rational layout in combination with the construction situation of the existing urban development area. Through analysis, calculation, comparison and demonstration, the planning schemes for lake reservoirs and river courses are put forward to form the flood control, water resources and water environment engineering system in the new area, which provides the design basis for the construction of other wading infrastructures such as roads, bridges and pipelines.