Abstract: Yinghu Lake is a planned lake on Chongming island of Shanghai. To create a favorable hydraulic dynamic condition for the improvement and maintenance of sound water environment, the bottom geography of Yinghu Lake is analyzed and designed. In the combination of the bottom flat form of the lake and by using Delft-3D model, a 3D hydraulic dynamic model of Yinghu Lake is developed, which is used to calculate the wind-driven 3D flow field. On the basis of the calculation results, the stratum flow state and flow velocity are analyzed and the rationality of the lake bottom form design are verified in the terms of hydraulic dynamics and biodiversity. It provides basis for the design and future operation of the lake.