Abstract: For the purpose of rapid simulation for bankful flood routing on large scale compound channel, based on previous studies on one-dimensional and two-dimensional flood routing models, one dimensional main channel hydrodynamic model and two dimensional hydrodynamic model were laterally coupled by simplifying and nesting main channel and flood plain with rectangle grids and triangle grids, in which water exchanges between grids, floodplain and main channel were simulated. The model was verified with a measured flood process in the lower reaches of the Yellow River numbered as flood "96·8". The simulation results for flood routing in section between Huayuankou hydrometric station and Jiahetan Hydrometric station indicate that the model performs well for simulating of bankful flood process routing on complex river channel.