本文介绍的黄河下游宽浅河段汛期水沙运动仿真模型建立在二维不恒定流与不平衡输沙理论的基础上，采用无结构不规则网络，结合了有限差分法和有限体积法的优点，能较充分地反映滩区、生产堤与滩槽冲淤变化对洪水演进的显著影响，并具有实时动态图象显示和人机对话功能． The simulation model of water and sediment movement in flood season in the lower reaches of the Yellow River presented in this paper is based on the two-dimensional unsteady flow theory and the unbalanced sediment transport theory. The structure-free irregular network is used to combine the advantages of finite difference method and finite volume method , Which can more fully reflect the significant influence on the evolution of flood caused by the erosion and sedimentation of beach area, production dike and trough, and has the functions of real-time dynamic image display and man-machine dialogue.