Based on the physical model of the Dongxikou gravel beach in the upstream of the Yangtze River,a series of experiment on the characteristics of annual gravel transport were conducted.According to the measured data of the gravel transport under different hydrodynamic conditions,the velocity of the gravel is established from the dynamic mechanism.The 2D numerical model is improved considering the above research results,and then applied to simulate the process of the gravel transport in the Dongxikou gravel beach.The calculated distribution of gravel transport and the process of sediment scouring and silting are compared with the measured values,and the track of gravel walking is basically consistent with the sand walking in the channel.It is shown that the improved two-dimensional gravel model can reflect the characteristics of gravel transport in the river,and can provide theoretical and data support for solving the sediment problem in the upstream of the Yangtze River and waterway regulation project.