Abstract: According to the characteristics of Huai He river basin,a flood routine numerical model is established in this paper.This model is based on hydrodynamics method of combination 1-D channel flow modeling with 2-D flood plain flow modeling,and hydrology method of no data areas modeling.The technology and skill of solving the combination 1-D flow wish 2-D flow and treating the runoff in no data areas are developed,which are key to successful modeling.It is showed in the 9 times floods modeling calculations that the model has high accuracy,practicality,flexibility and universality.The model is a advanced tool of Huai He river basin flood control planning and can be used in other basins.