Abstract: The cascade hydropreject construction and waterway regulation are two development modes commonly used in the inland waterway navigation engineering. In practice, comprehensive comparison and demonstration is needed to optimize the development plan. By means of the hydrodynamic numerical calculation method, the effects of the Lingma hydropreject construction and deep excavation of waterway in the Jinhua River navigation development project are compared and analyzed, and the construction scheme is demonstrated and optimized in this paper. The analysis results show that if the maximum dredging depth is more than 5 m in the deep excavation of the waterway, the bare beach caused by the flow into the deep pool will bring damage to the environment and ecology. The Lingma cascade hydropreject construction scheme in the lower reaches of the Jinhua River can not only increase the navigation guarantee rate to more than 95%, but also significantly improve the water ecological environment and human landscape in the region. It is a necessary condition to achieve the goal of the Jinhua River class Ⅳ waterway construction.