Abstract:With the development of social economy, the demand of the people for the living environment is getting higher and higher. The landscape water body is a touch of green in the steel reinforced concrete forest, and provides the confortable and casual living space for the people. But in the design of landscape lakes, there are many problems to be solved. At present, the essentials of many literatures are emphasized also in the aspects of the water flow replenishment and water quality control of lake bodies. On the contrary, the most basic flood control safety is often neglected. Combined with a practical case, a landscape lake area of Nanjing is studied from the aspect of flood control planning, and the water balance analysis is carried out. The proposal for the control of water quality is put forward, which can be referred for the similar projects in the future.