Abstract: Hydrodynamics and sediment transport model are generallyused to simulate the evolution of natural alluvial rivers. In this paper, anexplicit recursive method for sediment transport in channel network ispresented. Based on hydrodynamic calculation, the method can be used todirectly calculate non-equilibrium sediment transport process, involvingsuspended load and bed-load gradation adjustments one by one node in eachriver. This method avoids solving the matrix of the relationship betweenfirst and last sections, which is popular in traditional methods. Aone-dimensional mathematical model with the sediment transport method isapplied to the Jingjiang River-Dongting Lake region in the Three GorgesProject. Results are greatly in accord with the actual measurement.Computation cost is reduced and high accuracy is obtained in the new method.Moreover, the differences among different models of suspended load diversionin the node are discussed in the paper.