Abstract: Using the flood control system in the middle and lower reaches of the Yangtze River as study objects,a numerical model for the smiulation of flow-sedmient transport rates in the rivers and lakes of the reaches is presented.The model is a further development of the numerical flood module that is part of a complex flood control system and able to provide information for flood control planning.A dam module based on hydrodynamics is embedded into the numerical model to forming an integrated modeling system.The latter is used to study the control of flowsed mient transport rates under different planning requirements.In addition,a distribution modeling study of sediment transport through distributed channels is carried out.The integrated system is used to evaluate the flood control plan in the middle and lower reaches of the Yangtze River,as well as to simulate the control branch streng then main stream program in the Dong ting lake region.The result shows that the integrated system is able to effectively address key issues such as assessing the effectiveness of flood control projects and the procedure for optmiizing the projects.Quantitative information can thus be provided by the system for flood control planning.Our results have been used in the planning of flood control projects for the middle and lower reaches of the Yangtze River.