Abstract: A flood control operation model for Linhuaigang flood control project on Huai River is developed in this paper.The model is based on the middle breach of Huai River from Runheji to Lutaizi sections,which combines with 1-D for the branch and 2-D model for the main river and flood retention basin.The verification of the model is carried out by using flood of 1982 and 1991 data.They show that the results using this model are good agreeable with the field data However,the model can be applied to forecast the flood process and determined optimal operation modes for Linhuaigang project and flood retentions.